We All Know Women Do Not Make Wise Decisions.
Of this being a typical John Hughes film, everything has to wrap up nicely.
Duckie meets and beautiful girl who likes him, at the last minute (lol). Rich guy selects poor girl and live happily ever after (lol).
But lets take a look into reality. Women are conditioned to marry up. Rich guys know this, which is why those guys are always jerks. But women would except their bad behavior over a Duckie-type guys bad behavior, because they are blinded by the lifestyle. Duckie is always the better choice, but women think they can have it all (The rich guy husband, the guy best friend, etc.). But love only works with sacrifice and risk, not obvious financial security. Choose Duckie, He would eventually mature, and now you have a guy who understands you.
But you all wont. You would chose problematic guy with the money. It will be good at first. And then it will turn into a life full of backstabbing, worries, cheating and maybe even abuse.