Increase the amount of upvotes and comments you get on your Reddit links
by keeping the Reddit vote button on the shared page.
When people go to the url that you've submitted to Reddit, they won't have to hit the back button to upvote your post.
It'll stay right there on the page making it that much easier for the person to click up
Giving you more link karma, user comments and better chances of reaching the front pages of your subreddits.