No, but some treatment is often times better than no treatment (totally circumstances where having some treatment that's not properly placed can mess up the acoustics of a room).
Oh absolutely, every bit counts. It just bugs me a bit that somebody would post about how $200 of foam is amazing and totally changed their room. It isn't okay to spread misinformation just because you don't know any better. Killing a tiny bit of flutter echo doesn't make a room treated, and advocating to other people that foam is wonderful and helpful does more harm than good.
Putting 2 inches of foam in the corners and rambling about how it made the bass response better is even worse. Other people in this thread might see that and think it's actually true, and then go out and waste their money on the same garbage. I just want people to approach treatment from more realistic direction, where treatment decisions are based on measurement data (which, I would remind everybody in this thread, is both free and dead simple to use) and not completely anecdotal.