It's hard to say if a mac client would make sense for SE. The mac install base would obviously only be a small fraction of the Windows base. That said, it's probably not an entirely insignificant number. As a player, I'm pretty much all for it. The argument of "if they do this they won't have time to do x" is bunk, as I'm sure they'd bring in new team members to do the port. It would bring in some amount of new players... my guess is probably somewhere around 5-10% the number of Windows players.

Apple has never been good at fostering a gaming environment on the mac, and in fact has driven away a lot of great titles in the past. However, the idea that macs are underpowered or incapable is patently ridiculous.

Yoshi is of course right though, most mac users who are gamers own and use a gaming PC. I fall into that camp, but assuming a $30 price tag I'd probably buy the mac client so I can play it on my macbook w/o needing to dual boot.