Amateur. That means participants are not paid!
That said, although you offer your time free of charge for the love of the theatre, in the end we are (to cover our costs only) performing to a paying audience, so our production standards and level of commitment are as high (if not higher) than any professional theatre company.
Bottom line? – Once you are part of the cast or crew for a particular play, stop thinking of it as a hobby. Rather think of it as a job where you just happen to have fun and meet like-minded people.