Vote power recharges at 20% per day. But if you vote with less than 100% voting power, then you will not have the full power of your total STEEM POWER. Therefore the more you use, the less your votes value. And to be in Steemit just to "make"money makes no sense. Everyone gives up eventually if coming with that concept.

On the other hand, STEEM Power is a very useful tool, in several aspects. If you are not worried to maintain a close to 100% voting power, then you are for sure loosing money. But more importantly, you are not taking advantage of your STEEM Power correctly.