Boomerang Gift
Sending money or gift to someone knowing full well that you are likely getting the same amount or identical gift from that same person in return as a gift.
I gave my brother some cash for X-mas and he gave me the same amount for my X-mas gift. Gotta love a Boomerang Gift!
Boomerang gift
A gift whose value or benefit accrues as much or more to the giver as the recipient. Examples: You give your partner season tickets knowing full well that you will always go together. Or you give a woman beautiful lingerie that you will appreciate as much as she. Or you take a date to dinner at a restaurant you both enjoy.
"The next present was obviously a boomerang gift, but that's all right. I wanted it anyway."