I too am puzzled, but I suspect this wasn't one-sided - otherwise it would be obvious! It may not have been turn-taking exactly - I am thinking of thanks for a favour. Such as allowing someone to park on your drive every night, or providing a regular coffee stop, may then 'treat' you regularly to say thank you.
JWs as a whole don't attempt to control the congregation's money, but being a member may place certain obligations that the friend is finding awkward.