if like that all super bikes need to be thrown away as there is no protection but only satisfaction when riding it 

Nope. If u buy  2nd hand car which needs alot of repairs, u will end up spending more. And btw, when u repair ur car u need to pay cold hard cash. Whereas when u buy new, u can put everything into the loan. So new is always better than old unless u buy from a trusted fren and u knoe the cars history. If not, go for new

What I need to know is when people say high maintenance cost, how high is high?

Proton also can be very expensive if you wanted to. Satria 1.3 throttle body was quoted RM3,000 from Proton parts glenmarie, Waja side mirror RM400. I've seen Waja R3 front brake pad rm600++, siao aa?! Proton think they're ferrari aa can charge their parts with that kinda price?

Then from personal experience I kena ketuk by some tyre shops before. Waja door handle rm80, fuel pump rm650. Once, it overheat, the radiator kering cuz got some leak, rm600++. All which I partly blame myself, I could've avoided getting ketuk so much if I'm more diligent on maintaining the car. Still though, not the kinda bill one would expect for maintaining "just" a proton.