The game has very positive reviews, and selling the trading cardz will probably give you a small profit. Think "Gearcrack Arena". I use IdleMaster these days to get cards without having to install the games. I just have it running in the background while doing doing non-gaming activities.
Other items on sale with good reviews include:
Guilty Gear X2 #Reload $2.50 http://store.steampowered.com/app/314030/?snr=1_7_7_weeklong…
Sky Gamblers: Storm Raiders $3.39 http://store.steampowered.com/app/304910
Killer is Dead $5 http://store.steampowered.com/app/261110/?snr=1_4_4__43
Merchants of Katan (oops Kaidan) $7.70 http://store.steampowered.com/app/294020/?snr=1_7_7_weeklong…
3 cards, 3c each to your account…. effectively a 5c game. More than worth it, it seems