I think it's worth it if you are a gamer and can use the cards for playing games.  Though you'll fall short of breaking even on bitcoins, they'll subsidize your gaming habit.  Presumably, you'll only play a few hours a day at most, and the rest of the time, the cards are just sitting there doing nothing.

This is somewhat like the reasoning that people pan for gold.  The ones who are good at it say they make around $30k per year.  That's a pretty meager wage, but for someone who enjoys being outdoors, in the stream, it's a pretty good job.  Expenses are limited, and rent is cheap (if they rent at all - that land out there is cheap).  If you love the work, you're going to enjoy life.