I was asked to stop taking pics at a DVP game in May, and another bloke there reckoned they can't actually stop you or throw you out and no copper would bother because it's a not a public order offence, but I understand it's not worth the hassle.
Are you making money from this? Are the club losing money? Does it diminish people's interest in the 'product'? I'm guessing no to all those questions. So it just comes across as controlling, pompous and eager to pinch every penny they can.
Bad luck, Jon; you did well keeping it going for this long.