I'd have thought £10 would be reasonable for National League level.
I do think it is a necessity for several reasons;
- Capacity will almost certainly be limited - Away fans are likely to be banned - There will be a second spike and localised flare ups, which will result in lock downs and crowds being completely banned - Some fans will be shielding or won't want to risk attending an event with crowds
And if decent revenue streams aren't created very quickly we will see Clubs going to the wall soon
I just hope the National League isn't relying on social distancing and masks, because if they are many Clubs will be screwed.