Ted,
I have never, ever had a booker question my Union Membership (Equity). Equity is generally thought of by the public as an actors union, not a "performers", and if we all kept to the rate card, we would probably be the guys working for £50, have you SEEN the daily rates for walk-ons for example?
I know Equity members who are pleased with £100 per day, I work "non-Union" jobs for customers around the World, and (literally) earn that before breakfast some days.
In the last year I have auditioned for 200+ voiceover jobs, and not ONE has specified use of Union talent as a requirement - whilst having some great benefits, (such as the Public Liability Insurance rates), it seems to be becoming increasingly irrelevant, for me anyway.
For magicians, my feeling is that being a Member of Magic Circle
may make you more appealing for a booker, (they THINK it means "better", although we all know this is not necessarily the case...), being a member of Equity
might help (if they want you to be "entertaining"), but none of these affects price/fee at all.
We all charge what our chosen markets can support. If we screw up - we'll not work again.
The World is changing,
everything is more easily available. We each need to find our own way of reacting to it in order to get back to earning what we all need to earn, or want to earn.
Bruce