Should I Try Promoting A Video?

Should I try to actually use the promote feature? I had to take down then re-upload a video, but for the second upload it never gets as good of a shot, either because Youtube recognizes it as a re-upload, or my core viewers have already seen it the first time through, and so it doesn't get that initial boost from them like the first time.

I just want to know if people have tried using "promote video" and if you had a good experience? My concern is that once Youtube knows I'm willing to pay to promote a video, will they hold back my other videos to try to get me to do it again?