I think that whether or not a reblog brings any extra views has a lot to do with whether or not it actually puts a post in front of more eyeballs. I don't have a whole lot of followers, even fewer that actively read what I post, so if I reblog something, chances are it won't bring a single extra vote to the creator. If someone like nonameslefttouse reblogs a post, it will likely be a different story.

I reblog posts that I think support the other info my blog. I figure that most people who check out my profile are looking for info on building, repairs, or gardening, so I try to ensure that everything I reblog (which is very little) helps people learn something in those areas.

In my experience, cross-posting is a much better way to get eyeballs on a post, but of course, not every community is friendly to that.