Yes it is very unreasonable. Supporters go to matches to be entertained, and with no guarantee of good entertainment at that. There is no guarantee of success for their team either. You've paid to get in and watch, no more.

You pays your money and you takes your chance. If you go to watch a film and don't like it, would you go and boycott the cinema and stop others watching it? Especially those who may have travelled 100 miles to get there,?