First of all, heavy != out of shape. Would you like to tell an NFL lineman that he's out of shape? I'd be willing to bet, though, that every single one of them has a BMI greater than 30.
For myself, while I agree that I could stand to loose a few pounds, I also exercise more and more regularly than anyone else I know. In an average week, I get in about 16-18 hours of exercise and burn, according to my HRM, between 8,000 and 10,000 calories. I'm not the fastest rider or the strongest in the gym, but I'm regular on both, which is much more than most of the rest of the population can say.
That being said, I too would like to see some larger sizes in cyclewear. Actually, I'm pretty Fred most of the time, but I would like some more options for my winter stuff.