What celebrities say and do aren't always one in the same. After all, Michael Jackson says he's only had plastic surgery twice. Others aren't even that open, saying they just "...drink a lot of water..." While stars having children out of wedlock may no longer shock the public, nothing stirs up controversy like the details of their diet and exercise regimens. As such, their publicists tend to play down the details.
The other difference is that a good many of us on these boards aspire to a physique ideal that's more athletic than the Hollywood look. Even the fitness model body is more muscular than anything in Hollywood. Many on here are actual competitors, bodybuilders, fitness, figure, powerlifters, judges or trainers. Others may not compete or work in the fitness industry, but we enjoy the benefits of the training lifestyle and want to learn from those who do.
As you'll find from just reading these boards, no one does exactly the same thing. All bodies are different. What works for one may not for another. Also, what works for one body at one time will not work forever. No one here has anything to gain by giving out bad information, most are just sharing what's worked or hasn't worked for them.