I have the same problem, and it often leads to me never spending it because I can never make up my mind. So it goes unseen for a month or two until I find it again only to go through the whole process.
If I want to support an artist I usually just buy their CD or a Live DVD, sometimes even go to their concert if by some miracle they show up anywhere near me.
I can't decide which song to actually buy...because I've already downloaded the ones I like