Supporterbet was started for sport fans, specially football fans. Suporterbet wrote:
Supporterbet Limited is a betting exchange provider specifically for sport fans. Supporterbet.com is our online football betting exchange that aims to revolutionize football betting and its returns to the supporter community.
It never got the turnover needed to maintain a betting exchange. Else it was a really great odds exchange.
There is only one betting exchange that I can recommend to replace Suppporterbet, that is This One