Miners are making more money that makes them to be profitable even after all the expenses, if miners can't able to make profits and stop their operations the one who remains will enjoy the rewards.
this is not that terrible, Findingnemo )
thanks for reply, but please be advised that that 10% was just an example to explain the concept, but I would offer a logarithmic approach to the oxidation fee that just gets curvy shapes in last years.. and please consider that, a blockchain system is not a bank. the closest entities in decentralized echo-systems to the banks are crypto exchanges, which already have several EARN programs for customers too and charge their own level of fees.
but miners should work and benefit to make everything safe for end users.
p.s.: blockchains could get consider as digital version of Safe Deposit Boxes that everybody could RENT and put banknotes in it. I really do not know a bank in the world that pay interest to values in safe boxes.