"Here is something that does annoy me.
The different pricing for different guests,that implies that one guest is better than another,"

Why, Dick? Concerts at every level charge different amounts for different performers. I had Park Bench Social Club a couple of weeks ago. Young, fresh, exciting musucians - £8 on the door. I have Ralph McTell in a couple of months. Tickets are £16.50. It's not a value judgement. It's about what the market will take, based on many different factors, not least of which is the artist's fee.

Are you suggesting that every artist should receive the exact same fee, regardless of longevity of career, size of fanbase, etc?

And if people will pay more in a venue to see some artists than others, why not in a folk club?