PadMalcom, adult gamers (particularly 20s) are a much much bigger group than 16 and under. Also, 16 and under have less awareness of what's out there (they tend to just see whatever gets advertised on TV) and less control over what they get (they earn less money and/or rely on gifts from parents who found out there's a new FIFA/Madden/NHL/etc).

In terms of engine support, you want GS to work on entering a saturated market that most of us won't be able to develop for rather than an under-utilised tech-savvy market who look for what they want instead of getting told what they want by publishers with big marketing bucks? I don't.

EDIT: This article is relevant. XBox has huge gamer-share, but its user-base is less indie-friendly. Much less. Linux users, on the other hand, are all about the work of the little guy.