So Jimmy's Revenge Against Chuck Is...[Spoiler]

Yeah it's getting nasty between those two. The sibling rivalry between Jimmy and Chuck should be the greatest in history.

I think it is safe to say this was an unforeseen consequence and thus was not factored into Jimmy's original plan. Had he known this would have happened he may have chosen a different route entirely(maybe accepting he can't practice law simply due to not being able to afford it). Now he has committed to regaining his practice, but suddenly is confronted with what appears insurmountable and that led him to level the playing field more accurately.
Chuck doesn't even seem to really respect the law. He plays by the rules to secure his own position and reputation, but his little speech on the stand goes to show that he thinks he is the arbiter of justice, and it was up to him to see justice done against Jimmy. Reality is, he is an officer of the court and has no duty/obligation/entitlement to conduct sting operations or entrap(in Chuck's words, "provoked an admission in adverse interest" & "exaggerated the symptoms of my disease to extract the truth") people.
Even if you take Chuck at his word, he is still a conniving, delusional, uncaring, asshat.

You admit Chuck is mentally unwell. Doesn't that also call into question anything he says/claims/does? He is unable to admit he is even ill, which makes his judgement all the more suspect.

Chuck also claims there is EMF(electromagnetic field) emanating from a mobile phone battery alone. That is scientifically untrue and impossible.

Everything about Chuck screams insane douche bag that needs to go down in flames.

If the OP is correct, then their relationship is going into the turlet for a reason. Relationships between brothers can be good or bad and it appears that they are heading for the latter. They will be destroying what's left of their family. Rebecca could have been part of this family, but it did not work out for some reason. Possibly, that's why she wanted Jimmy to help Chuck when he wasn't answering the door. It could mean that she's going to take sides if she decides to get involved. She thinks Chuck has lost his mind. Then there is Kim, who could have been Mrs. McGill, but their relationship hasn't progressed to that point. We still have three episodes to go this season and I'm hoping for some kind of resolution at the end. Unfortunately, there won't be an episode this week due to the holiday.

Chuck deserves every bit of it, mentally ill or not. He tried to get his brother disbarred so there are obviously repercussions. Jimmy took care of his lousy, insane brother for years and all he got was grief... mainly because Chuck was jealous of his brother. Jimmy is a flawed man like all people on Earth and I can understand Chuck being annoyed by him but he tried to take away his livelihood. At this point, turnabout is fair play.

"Didn't seem premeditated"

Premeditation, legally speaking, requires only a moment to think about what you are going to do. There does not need to be an elaborate plan or any significant amount of time passed between thinking about it and doing it.

And how frustrating that finding people willing to buy airtime for a commercial would be such an arduous task. Jimmy is really having a hard time trying to impress Kim.

You're right, he couldn't have planned it. He didn't know until that meeting that he'd have to deal with a much higher premium as a result of his suspension.

But when he processed that, he quickly concluded that, if he was damaged, Chuck would be completely sunk if the insurer realized how high-risk someone that unstable would be for them to cover.

Jimmy saw the chance to stick the shiv in and twist it, and did it with some glee. The expression on his face at the very end shows us a much darker, malevolent side of Jimmy.

Absolutely right.

Lets not forget how Jimmy spent years looking after Chuck, and Chuck repaid him by getting his license to practice law suspended for a year. And this wasn't the first time Chuck sabotaged Jimmy. Every time Jimmy tried to get ahead in life, Chuck would push him down.

Chuck is a sick and evil human being, and Jimmy is finally fed up with being the caring and loving brother. I really can't blame him for that.

As far as Jimmy wanting a refund of his insurance payment, I just don't see how the insurance company can legally keep the money. They are collecting money for nothing, since he cannot practice law. This would be like an insurance company continuing to charge you home owner's insurance after your house burns down, or billing you for life insurance after you are dead.

If his license to practice was suspended, his insurance premiums should be suspended too for the duration. After he regains his license they can jack up his rates, but I don't see how they can ethically collect premiums when it is impossible for them to be insuring anything for the next year.

Terrific point. It's hard to realize that all the efforts to help Chuck by bringing him food, supplies and reading materials, were actually enabling him in his sickness.

And even with the malpractice insurance hike, he will still be able to practice law-- just not the types of cases he probably would want. Also, there are other places to obtain Malpractice insurance; not every insurance firm was contaminated by Jimmy's mechanations.