Hi THJ,
Of the 7 comparatively similar entry costs you have listed above, three, the West End Theatre tickets, Provincial Theatre Tickets & Premiership Football tickets all have much greater travel/accommodation costs than the other options so a direct comparison is difficult to make.
As my current financial circumstances and love for my local speedway stand I personally would pay £25 as a maxim to attend speedway at Championship level of competition, this does not include any travel or accommodation costs which I have never considered for home meetings.
If however my finances were reduced to say a pension income which is creeping much closer I would still be happy to pay £20.00.
I feel that this seasons entry fees could be raised for next season forward considering the success the team had this season.
Realistically we want to start the season on somewhere near equal terms to the season just past so a reasonable increase of £3 for Adults to £18.00 & £2 for Children under 16 to £15.00.
You can't have a really competitive team without paying reasonable entrance fee,s.