Why Do People Quit Jujitsu?

Most people quit jujitsu at white belt. The beginners, I think I've read 90%. 90% of people who start jujitsu, the first day they take one day of jujitsu,. 90% quit before the next belt, which is blue belt. That's a huge amount to quit. A lot of people blame sparring too soon because if someone on their first day they have to fight another guy, another guy who's much better than them and lose badly. This can cause them to get stressed and quit.