mba 2013 - 4gb or 8gb ram config?

I used to be a hardcore pc gamer, but really don't play nearly as much as I used to. I've recently bought a 2013 mba and have found that it actually suits my remaining gaming needs pretty decently - ie SC2, dota2. So the question is, is it worth it to upgrade to the 8gb ram model for this use case. My gut says yes (and would instantly do it on a pc), but I'm new to macs so I'm just a little unsure. please don't bother flaming about games/macs/etc..