no, I dont agree,
admission fee does not necessarily have a bearing on payment.I recently did a couple of gigs in Sicily with Richard Grainger.
at one of these gigs there were 300 people present,they were an attentive appreciative audience,and there was no charge,however I got a good fee,plus my travelling expenses.
I dont care what the admission fee is,providing I get a good audience and get my fee,in fact I would rather play to 300 people[if its free] than 30 people paying a tenner.
if an organiser can get subsidies[all well and good] and pass it on ,it means the less well heeled can appreciate and afford entrance.