Poll: Did you upvote you last post because of it's value or because of hopes for monetary gain from the upvote?

Please pick your answer:

a) I upvoted purely because of the value the post gave to me
b) I upvoted because of hopes of gaining some reward from the upvote on a potentially popular post
c) I upvoted for both reasons at the same time

I ask this question because I find it disturbing that I have myself upvoted at least 2 photo posts today that I would not have upvoted for when there was not a potential to gain some monetary value from the upvote.

Please be honest in your answer.