We have been travelling to Southern Spain through France for the last 10 years (except Covid years). Generally speaking pre Covid excellent sites were between 16 and 20 euro. Last September fees had risen to 25-30 Euros. Like for like in the UK I would think £40-£50. All of the euro sites had a bar, cafe, shop, dry hard site and good well kept toilets. Nearly all off the beaten track, Dordogne area, is magic. Tend to find that the continentals are far more open to conversation than many brit sites, and none of this 'keeping up with the jones's attitude) some campers and moho owners have. Boy racer mentality, or as on this forum 'what did you buy today'.
Regarding C&CC, although it says Club in it's title, it is share owner owned with Directors and Executive salaries to pay for. As in most volunteer run clubs, there would be AGM's and elections etc. C&CC is it's our club, our rules, our prices and we have much higher overheads. Dosn't necessarily equate to value for money.
I think the idea posted earlier of recommended sites posted on the forum would be great. Who knows if the uptake is sufficient may attract a T6Forum discount.
As for myself in the UK use only voluntary run sites or the Brit Stop Book. Another thing to remember is that hotel costs have gone through the roof as staff costs are now at least 25% of any revenue. Good chefs are now asking £50-£70k i.e. more than the Manager and in a Pub more than the owner. Hence why camp site owners are charging more, because they can.