Voted for Yes, several times.

The boost has to be significant for it to really make much of a difference. If you lease like 100 SP, that won't make any difference over 30 or 90 days really. It'll also only cost you a handful of Steem. If you lease 10,000 Steem Power, and you sell your votes, work toward profitable manual curation, and do some tasteful self upvoting, it can pay off. Even if it's sort of like breaking even when it comes to the actual financial investment, you can gain followers and attention if you have a powerful upvote.