You're going to get lots of business!
When I used to do it, most people would ask me how much I wanted, and I'd tell them to pay me whatever they thought I was worth...some gave me $10, some gave me $100... To me it was just an easy way to go herping.
Once got a call from a lady near Mt Coot-tha saying she had a carpet snake in her ceiling...it was a Stephens. Didn't bring a hook/pinner or anything...that was interesting.