Wasteful
One of my biggest problems with this show is that they never try to salvage anything they rip out of the house! They just tear it all apart and throw it in the dumpster instead of salvaging, selling, or donating it. I realize that it would take a bit more time to do, but these people are always at the top of their budget and could use a little bit more cash. Money aside, they throw away things all the time that are often in good shape and just need a little TLC or could be donated.
In one of the first episodes, one of the brothers just tosses a perfectly good (although pretty ugly) chandelier in the dumpster without giving it a second thought. They also almost never refinish the existing hardwood floors and opt for replacing the entire floor, which costs a ton of money when the existing floor would look really nice when refinished and would have that rustic look that is unique.
If you've seen Rehab Addict then you know what i'm talking about. She is always trying to fix old pieces rather than buying new, refinishing old hardwood floors, and had salvage crews come in and take away things for free (or she gets money for them) and they are used elsewhere. She always ends up with beautiful rooms that are one of a kind instead of cookie cutter and she keeps costs low.
During one episode in season 1, I was pleasantly surprised when they used the existing cabinets and brought in matching doors for the ones that were gone, rather than gutting the entire kitchen. You could not tell that they had brought in new ones to match the existing ones, and it was very cost effective. Sometimes cabinets just need a fresh coat of paint and new hardware.