Ask HN: How do I sell my (M)MORPG?

So I have this everyday problem of having a smallish MMORPG hanging around and I need to get rid of it. It makes on average maybe 500$ profit a month, but can surely be made bigger by someone who actually works on it. Personally I haven't had motivation to work on it for about half a year.

So, uh, what kind of sites are there where I could put up an ad for this kind of thing? Or should I shamelessly email competitors or something?

The game in question can be found at http://www.zezeniaonline.com