Between us DH and I have 4 godchildren and they each get a present for every birthday and Christmas. For 2 of the godchildren we always get a polite thank you letter, but for the other 2 we hear absolutely nothing and sometimes I even wonder if they received the gift! Or occasionally I might get a message on facebook if I'm lucky ;-)
Perhaps it is just me but having gone to the trouble and expense of buying and sending a present I think it is good manners to send a short thank you. Or AIBU? What do you think?