It's interesting because a lot of the anime I bought due to said awesome AMV is actually not to my taste. Some of the anime I don't like at all, and wish I hadn't been misled by the AMV!
Conversely, have you ever bought anime strictly to make an AMV with it?
Because the other half of my anime collection is composed of that stuff- "Hey this looks cool, I'd like to edit with it."
So, suffice to say, I've contributed to the anime economy in a not-insignificant way, mostly for anime I don't even like!!

How about you all?