When guests ask my fee, I tell them and then steer the conversation to their problem. Half the time, they don’t need a visit. If so, they’re grateful for the advice, especially after learning that I don’t charge for phone calls. It’s good public relations, but I also don’t like to make a housecall and collect money for a trivial service.
If you google “house call doctor” plenty of eager individuals and national housecall services turn up but not me. None deliver free care, so the caller has the choice of a paying visit or nothing. A doctor (sometimes me if you call a national service) may come, hand over a prescription for a medicine you accidentally left at home, and then collect several hundred dollars.