Nooo I just wasted $2 on Remember Me! :(
I wasted $6 on Saturday between Shadowrun Returns and Dragonfall. I'm still okay with that, though. When I start to accumulate much of a Rewards balance I always start worrying that my account will get banned for something.
Speaking of which, I just figured out another really obvious and easy way to game Playfire Rewards that could (with a bit of work) get you 6x your rewards; Family Sharing. Create 5 alt accounts, give all the alts access to your library, then as rewards are offered just switch between them to get the rewards. Since Steam doesn't differentiate games on your system from one account to another, you can download the game once and you're good to go for all 6 accounts (or SAM, if you're into that.)
Of course, this would require swapping between Steam accounts every time, and maintaining 6 separate sets of rewards through Playfire. There's definitely some tedium involved...but doable if somebody really wanted to. Way too much work for me, but you could do this and have it be absolutely legitimate (if you didn't SAM.)
Edit: Actually using the same system for all the accounts would mean that you'd have the local save files for your games. As you swapped to an account and launched the game, it might immediately upload all the achievements from your local save files to the Steam server. Basically play once, get paid 6 times.
I haven't actually tested this, btw. But the logic works out.