To the OP, yes.
One pays 40ppc at both Coleys & Barbury, these are fully open 6 & 7 days a week, Id hazard a guess the pricing reflects the costs etc that these grounds need to recover being a full time business. For one I dont begrudge these costs as the opportunity for me to drop in, without booking / awaiting the weekend / restricted opening etc at any time during the week for the chance to work on some targets is “worth it” for me.
Am aware that there are less expensive options, for me, in my locality am not seeing the opportunity at the same level.