What's the issue .................
To be honest it's £10 !?!?!? Not exactly bank breaking is it ? Ideally yes you don't want to waste that £10 which is hard earned, so for instance ..........
1. If your 100% committed to turning up then it's not a waste of £10 ?
2. If something happens ie god forbid , car accident , sickness , family tragedy .....then last thing I'd be thinking about was £10 unless I was tighter than a coat of yacht varnish.
3. If you've no plan to turn up you can afford to loose £10 !
Think the main stick in the hornets nest is " what will happen to my £10 if I don't turn up "? , well I guess taking into account either point 2 or 3 above , you don't really care ! but just a thought lets give it to charity !