Yea, I might end up doing that or just sitting on them and hoping the demand increases.
Sitting on them won't do ya much good. DOTA 2 floods the market every few months. It's sort of like a pyramid scheme. Friend 1 gets 2 copies, passes it on. 1, 2, 4, 8, 16, 32, 64... and so on, until eventually, the market for them collapses because there will be more free copies of DOTA 2 then there are people. (Hypothetically.) My point is that as long as the DOTA 2 Devs keep on giving out copies, the game's pretty much worthless.