Accepting Payment for Free Service
As the story goes in the Book of Genesis, Efron offers Abraham Avinu the cave of Machpela for free. Abraham wants to pay for it. Efron then charges him a hefty sum of money. He is frowned upon for doing so.
I run a business where I sometimes offer to do free charity jobs for the poor or for people who are better off economically but have been through some rough times. Sometimes when I offer to do the assignment for free, the poor person still insists on paying me, in some cases quite a lot. It might hurt their feelings if I don’t accept. If I accept a payment such a payment, is that permitted, or does this behavior resemble Efron?