I don't know. I'm relatively sure it would be
less of a problem here than anywhere else.
I'll admit that I've spent some time thinking about how to game the
present system, here, not because I intended (or was even tempted, for that matter) to do so, but just as an intellectual exercise. I also analyze physical security systems when I see them, my brain just works that way, almost never actually test my theories though (there was one time at the library when I was in college, though ... but I also
worked there at the time

). Anyway, I believe the way it's set up now
could be gamed, but it'd be a lot of hassle, and not very effective.
I expect there might be some who would be tempted to game it if it were easier to do, if not any who are around presently, there's always the next guy to come in the door.
The way it's set up now, I kind of regard it as a challenge to post things that folks find helpful enough to give karma for (and I figured out early on that I wanted to keep on the lookout for other folks' posts I could give karma
to). That's also why I don't like posting
about karma, and usually put a disclaimer on such posts: it just seems too easy to get that way, feels like cheating.