Proper time to pay for In-laws

by Sheldon
(Layton)

I have been married for eight years now and my wife just told me that her parents hate it when I pay for stuff. I have paid for one meal over $75 for 6 people and she told me I was wrong for doing it. She told me that every time I pay for anything makes them mad and the yell at my wife for it. The stuff I do pay for is not more than $15 and it maybe once a month. I’m just confused on this! I’m I wrong for trying to pay for stuff? They pay for everything else like Plane tickets, gas to come see them (over a $100), and trips to the cabin, etc. What should I do?