I am similar to you (just over 10k rep). Often when I answer a question, it is a tougher one that others shun away from. I may put in some real work to help the person. However, because the the level of difficulty of the question is higher, the level of understanding of the voter also needs to be higher to know if he/she should vote for the answer. Of course, there are other factors like the narrowness of applicability to a more difficult question and the time taken to even read the question if it is a longer one.