Whatever you receive for free is always a win, no matter it's value and power up means growth. Did you notice that you receive interest over the HP and basic dollar you take?
Well there will be a hardfork soon, let's see how Hive will do after that.
Also remember there's a limit to everything (there is to Bitcoin) m, to the pool and to what witnesses can do to pump the value. I would suggest you hodl.
RE: I power up with 300 HP.