Every Christmas I buy a present for my goddaughter and her siblings, I also buy my goddaughter a birthday present each year.
Goddaughter is now 10, and I can honestly say that in all the years Ive been buying for them Ive never once received a Thank You. Ever. I should add that I don't expect an extravagent, long handwritten letter or card but just a text or even a message to say that they've received the gifts would be nice. Over Christmas I will see them personally and they never say thank you to me, or anyone else for that matter. I therefore know its not personal and just a general lack of manners because their parents havent instilled it in them, but it really irks me.
DM made me personally phone everyone who'd bought me a present to say thank you every Christmas morning, and though that's also a bit extreme I just think an acknowledgement would be nice.
I feel like stopping altogether and spending more money on the family and friends who would actually appreciate it. Im not made of money.