real talk don't suspect that if trans people don't give gifts back it's because they're ungrateful. Some of us don't have our own incomes or have such low incomes that we literally cannot afford to buy you anything back. some of us have alternative income arrangements with partners, some of us have mountains of transition related debt, etc.
and in general if you give someone a gift, you shouldn't be creating an expectation of getting something back. that's why it's called a gift.