Why should you receive stake (belohnung oder rente) for coins you keep in your pocket?

When you put euro's or any other fiat currency in a bank account the bank gives you a reward / compensation in return because they use your money to make them more money. I don't see any - and I mean any - reason to reward or compensate coin holders. If you lend them to someone else one could expect and receive a compensation in return. This is already the case for ages and works perfectly fine. Why staking (creating free coins) without a reason?
Staking also brings about people to
hold their coins. On the contrary, Freicoin uses a demurrage mechanism probably to encourage people to
use their coins. Something currencies are meant for. There's a saying that 'coins need to roll' and I think that's more than true.
