How can Bitcoin stay cheap once the services required to support it are layered on top of it?
It can't. Bitcoin use will eventually become just as expensive as credit card use. Maybe even
more expensive.
That's a laugh.
OP, Bitcoin will in all likelihood become quite cheap, easy and efficient to use as money, more so than it is now even. Bitcoin is fundamentally
technology and that historically happens over time. Look at the television, airplane, car, telephone, cellphone, computer etc. All of these things started out as clunky toys for only the rich. Over time common people gained easy access. It's simply how technology evolves.
Bitcoin is still a baby and is
already capable of saving people money and increasing the security of their transactions against fraud (contrasted to
190 billion annual credit card fraud) because spending authorization (like card numbers) is never out in the open, and things like multisignature wallets will make super strong coin security easy.
Banks and credit cards were here before the Internet existed. If you redesigned the entire financial system from scratch you would probably get something that looks more like Bitcoin. Instead all the world's financial infrastructure rests upon that built up, clunky, inefficient,
legally hypocritical, fraud and privacy
vulnerable system.
Bitcoin is technology built with the benefit of hindsight, entering a space which hasn't seen innovation in over 50 years. If you're someone betting against it (looking at you exocytosis) good luck.