If a game costs $0.39 and drops 3 cards worth $0.15 each, your combo purchase is profitable.
Ensure the Steam bundle says "Complete your collection" so you aren't paying for games you already own. steam combo list
In underground hacking circles, a “combolist” is a text file containing email:password or username:password pairs. A “Steam combo list” specifically targets Steam accounts. If a game costs $0