The reality is, it is their money and they are free to do what they want with it. Expecting them to do anything other than what they want with it, will never end well.
If that is a concern of yours, you can use that as criteria to determine how you influence the reward pool with your own stake.
Ultimately this is all just another form of mining if you boil it down.
RE: Is it okay to stake the bare minimum HP and withdraw everything else?