you will probably make your post very visible and can probably get some good rewards, the other one is that these votes do add up to increase your RE
I agree and have used them for this purpose in the past. A little hypocritical of me of course, but this was due to a post I read that stated that if the good authors don't use them, the crappy posts will rise to the top!
I'm paying for my sins with these delegations :)
Thanks for the comments!