I don't like it either. The premine alone is bad enough. Staking it is even worse.
If you really need to secure the network, ok, stake it for a limited time, but make a transparent system where the coins gained from staking the premine are immediately burned.
The premine should be used for bounties, as was promised, not for creating additional coins or increasing the staking difficulty for everyone else who actually bought or mined their coins.
If you keep breaking your promises, no one will be able to trust you in the end.
And I'm saying this because I really like this project.