Founders often don't have a choice as to whether to accept buyout offers. In the case of OMGPOP, which had received a ton of VC funding and struggled for years until finally finding some success, I can definitely see why VCs would want to force a sale. (In fact, I wouldn't be surprised if VCs generally think that "make games for iOS" is not a business model that is capable of the kind of returns they need anymore, and they want to avoid taking further risk on that model—hence they forced the sale.)