No, I brought my child up to call me Mum, and he wouldn't have bought me anything that said MOM. However, now he's older, if he were to buy me something I didn't like, bearing in mind he's worked hard to earn the money to buy it, I'd ask if he minded if I changed it for something I would use, rather than let it sit in a cupboard, and therefore, go to waste.
I'm not 'having a pop' at Rocks, I've bought tons of things from them in the past, (ask anyone who knows me) and been very happy with them. I'm exercising my prerogative to express an opinion, which is, I personally do not wish to be addressed as Mom.