Theater Workshops - How's the Pay?

I am curious. I know workshops are a big component to the startup of a new show. Are the payment rates for workshops regulated by the Equity union? Are actors and musicians are paid less for workshops? I am guessing that the rate is much lower and that actors participate in workshops in the hope that they can be competitive for parts. I am interested in any information you can provide about theater workshops.

Am I reading this correctly? If an actor is NOT offered to continue in the role, or not offered the actual job if/when it does go to full production, they get 4 weeks salary?

So even if you suck or aren't right for any revisions your part endures or you "age out" you are still guaranteed a month's salary? wow.

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