I was wondering if anyone knew of any, moderately accurate, figures about just how many people play RPGs. Plus, how many play each system (which, added together, would be larger than the first number, as most play more than one system). Especially if the systems are reasonably broken down; D&D would definitely be the largest if you include every edition, plus the retroclones and OGL derivations. I think the latter should be considered separately, so White Box and Labyrinth Lord, for example, would have separate figures.