I'll be Mametchi.
"I think we should go camping." Mametchi agreed with Crepetchi. "There's clearly nothing to do, what else is better than a fun camping trip for all of us?"
I buy a Tamagotchi for entertainment, mostly, yeah. I'll probably start buying them for a collection as I grow older - but for now I look at what's new in a Tamagotchi before buying it. I know people collect rare ones though, even if they don't have much to offer. I hope to do that one day...