SPERX

I do not think that fines would work because they have to be enforceable - here in the UK criminal fines were widely ignored until the courts started getting serious about enforcement.

Also you need to have clear, unambiguous and well publicised rules and procedures - including an element of "procedural fairness" to avoid the situation where someone makes a malicious report of dangerous flying.

However, ultimately, do you really want a persistent offender in your Club?