Yours is a classic case of "ass-umption". I have no fee for working on clay & plastic casino chips. I do it as a hobby. My compensation has been mostly in the form gratuities and low end chips for my collection. I have been "stiffed" on four ocasions and given a bad check on another.
Until recently the total compensation for over five years working on these things was less than $400.00.

Have a nice day!!!!