Selling Uncharted 2

I've finally decided to sell my copy of Uncharted 2, at a cost of $55. In fact, it was reserved on Game Axis within an hour of me posting my sale.

Uncharted 2 is a great game, so great that:

Its value has dropped by only $5 over the past 3 months.
I bothered getting a platinum for it.
It's won many Game Of The Year awards.

I'm just thinking if this is what I'll do in future, selling games that I've completed/have no more interest in. It seems like the smarter thing to do, instead of letting dust gather on the cover.

Now, if only someone would bother buying Uncharted from me for $30....