If you vote less than (10) 100% votes in a day, you will still recover voting power (aka mana).

You would need to use a lot more than 10/day to stay where you are. At 30% VP a 100% vote uses 0.6% VP, and you still get 20% per day, so equilibrium there is more like 32 votes.

Even if you're spending 10/day or 15/day you'll eventually grow back to the point where that's equilibrium, just a little bit slower.

Of course, more than half the accounts in the system can't currently use 32 votes in a day anyway, so that becomes kind of moot.