And some markets are more limited than others.
Market for PCs: big.
Market for cutting edge PCs that cost >$3K just so their owners can shoot their weapons in Quake XXXIV 3/1000ths of a second faster than their opponents: small.
Maybe if you go and by the latest and greatest Dell, you will spend 3k. If you go to a local computer store and have them build you a mid range computer for gaming, you will pay less than 1k and have a very decent gaming PC. Remember, you don't have to go out and buy a monitor, speakers, printer, mouse, keyboard, USB devices every time you want to get a new PC. You could build it yourself and save even more money than from a local computer store. I used to do this. These days , I would rather pay a few extra bucks to have someone else build me a PC with the parts that I want.