Giant Robot Magazines needs your help. I'm pretty sure they could have sold the magazine for tons of money to some corporate publishing company many of times. That would have also defeated the purpose behind an indie magazine.
Probably some of your favorite artist and bands got their start up from this magazine. Always been a fan of it as it helped me discover tons of music/art and life lessons as well.
Every little bit counts. So if you have some extra cash, why not help out a magazine that helps your future favorite artist.
Not only are you donating to a great cause, but you get some really neat stuff in return!