The only way you can turn a -EV game into a +EV one is to gain an advantage. This advantage either increases the frequency of the payout or the size of the payout while the other stays the same or increases.

Eg coinflipping, and paying even money. In order to gain an advantage, you need to do one of these or both:
1) Find a method to flip better than 50% longerm
2) Get better than even money

Show me how a staking system could beat this example (and remember this is a breakeven scenario, not a -EV scenario which would be even harder).

A staking system is not an advantage in itself.