I see where you're coming from.
Patience is key on 99gamers. If you already have a backlog, it's much easier to be patient.
The only $$$ that comes out my pocket are when there are game sales($5-$20) or gamesharing.
There are some exceptions.
Other than that, I get games by reselling played games.
In short, I can purchase a game, then resell it for the same amount when I'm done.
The only cost for me was $2 in shipping fees and patience.
That value, sold me on 99gamers.