There has been a strong argument among some people on the matter of delegating sp, but I see nothing wrong with people who provide these services, because like you said, what you do to your flask is left to you.

There are some people whose self voting alone will help a minnow somewhere.

I don't really have much sp but I have a large community of newbie from Nigeria, to help my growing community I rent sp to help those who have been putting effort into posting quality content. With the growing population of steemit, spotting goof post will be difficult for whales who wants to help