[mihaifm]

The stake in the network. Each transaction is validated by representatives whose votes are proportional to their stake in the network. An attacker would need to gain 50% of the network value to be able to do some damage.

[throwaway415415]

You are not answering the question.

[PaulBGD_]

Users with high stakes generally want the network to run so their stakes aren't worthless. At least, that's the theory behind PoS.

[throwaway415415]

PoS by itself doesn't incentivize you to include transactions. That's called the "nothing at stake" problem.