In order to bet 2000 BTC you first gotta have it and belive if anyone would own that much bitcoin he wouldn't be wasting his precious time gambling on freebitco.in since he could buy the whole website including all the prizes they have for contests.
I don't think that the owner of the site would sell his/her legacy. Freebitco.in is one the pioneer here and no amount of money can equal to that.