All of Mike's DVDs that I have watched I back 100%. They are better than your average training DVD that just covers a bit of gym time and that's about all.
As for what Dave is saying, he may be oversimplifying things a little, but I think he is talking about cutting. Would it not be possible for a bodybuilder to diet strictly on the 6-7 foods that Dave listed?
Also, keep in mind while I can understand why it would not be a great idea to risk your health for no monetary compensation in the amateur ranks, Dave actually has a very successful business which is largely the result of his competitive background. So it's not like he got absolutely nothing out of his sacrifice. Obviously, being a bodybuilder helped his credibility to build his business up to a high level [over six figures annually]. He was also very close to winning his pro-card in 2007. Dave could probably win the 50+ Masters when he gets there but I don't really see a point. To be honest, I think Dave just wanted to turn pro because he was so close and it was sort of a personal thing for him. Just like I wanted to place a little higher at my strongman contest this weekend, but in hindsight, who cares? I tried my best and I hope Dave feels the same way about himself.