I love the hipster blame. I know one hipster with a CB. A dead stock but immaculate CB350T. Truth be told most of the hipsters I know can't afford any bike. Unless it's a single speed road bike. Nearly every person building a cafe racer I have ever known would probably gravitate toward the yuppie / square side. People who can afford $250 cafe seats, people who have garages to put on clip ons, rear sets and stretch tanks, etc. etc. It's not going to be a hipster in an apartment that stays up until 5am every day and gets stoned immediately when they wake up before they go to their bartender job. The interesting thing about both yuppies / squares and hipsters is nobody thinks they are one. They're all externally identified by people who probably are also a yuppie / square or hipster. Hipsters building cafe racers are not driving up the market. Everyone building cafe racers is. And most of them ain't hipsters.
Now I can see if you're some middle aged dude who went to like every Doobie Brothers concert in the 70s and owned a million bikes of all types and probably bought CB750s in the 80s and 90s for $150 how you could maybe be pretentious toward the younger generation- yuppie filth or hipster scum (who probably all look the same to you)- pricing you out of your hobby. But if you're like 30 and #$%*ing about hipsters building cafe racers it's really laughable.
EDIT:
Sorry for the rant. I just keep seeing people mention hipsters and cafe racers any time there's a discussion about the bike market. Then we look at this board with thousands of people, some building high dollar cafe racers. Either hipsters aren't the problem or there are A LOT of closet hipsters around here.