I gotta say, I used to buy that 30/g max/meal thing for years and it really held me back. I was getting only 180g/day max and after I got up to 215lbs I just stopped gaining.
I stayed like that for 15 years, thinking I'd reached my natural limit. Then when I upped the protein to 230/day I immediately started making gains in the gym and I gained 23 more pounds in a couple years.
So I wasted 15 years believing that canard.
From what I've read I think Seeker's right too, about excess causing gas -the protein is apparently actually rotting in there! I was taking about 350g/day while on EQ -it started giving me gas then stopped immediately after the EQ kicked in and never bothered me again. Same diet, same proteins, I think it's just that my body was now using it.
Just my .02.