I hate this too, but to continue the example, my actual real life bike shop struggled for years with bad websites sold to them by a succession of "developers".

The Facebook page appears to draw as much if not more business, and chap can run entire thing himself with no overheads. It's hardly a surprise some choose just to use Facebook really - as far as they are concerned its often "better" for them than the open web was, even if that is hard to swallow sometimes.