Payments by minutes played

The payments system is unfair as only has full or half match fees. This is unfair on players playing say 20 mins who pay the same as player playing 70 mins (ie both paying half match fees. The payments should be by minutes played so in this example 70 mins = 70/90 * £10 (full fee) = £7.77 20 mins = 20/90 * £10 (full fee) = £ 2.22 As opposed to both paying £5 Ps If everyone pays by card this is not a problem like cash It could also be an option setting for teams to pay in the 2 different ways