Startups are proto-businesses. Being a startup means you get to break the rules and out-compete established businesses, because you have nothing to lose. A startup is a business though, creating a startup is hacking the legal system and abusing the concept of corporation and limited liability, but it is still a business. Business means 'trying to make money'. If you don't make a huge multiple of what you would have made elsewhere, Startup is Fail. Acceptance of this leads to clear thinking, proper prioritization, and a much greater chance of success.
Any gambler will tell you that you must take a wager that offers positive expected value. However, they will also ruthlessly face reality and attempt to figure out what is happening if they keep losing over and over.
I guess what I'm saying is, Startup culture is valuable because of the chance of success only, failure is failure.