What do you do with the money you get from PTC/PTE/PTetc. sites?

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Well, I've been clicking on some PTC site for a while.. And now, I've been thinking about what I'll do with the money I'll get from it. As I'm thinking it won't be a very high ammount, I think I'll buy a book, a CD or something like that.. Maybe investing into referrals of a PTC site, but I'll need to know if it's worth, before. And what about you? What will you do with the money you'll get from all the sites that pays you for doing something (I'll include myLot in here, even knowing that the real intention behind myLot isn't earning)?