I'm also a college student and I'm kind of in this boat too, the only difference being that I already saw the tour and will be seeing it again next week. I bought a GA ticket for a third show (Detroit) knowing that it would sell out (GA tickets did), but I'm not sure if I can financially make the show work.
This has happened once or twice in the past with other shows, but those didn't have paperless tickets (fortunately, neither does this Detroit show). Basically, think it over and think about the resale value if you need to sell. Wait to buy your tickets until you've fully decided that you want to go. I will say that the tour is totally worth seeing at least once.