My reasons for losing interest in Tamagotchis? Good thread, Well back when Tamas first came out my sister had a school trip to America, Tama's weren't over here in the UK yet (1997) so everyone was talking about them, She brought me back one so that i had a Tama before anyone else, It was so awesome!
After a couple of months all of my friends had them, we were all in the last year of primary school (Not sure what the American equivalent is but aged about 11) After the summer holidays had finished we all went to high school, with the long break of summer holidays and the more "grown up" world of high school Tama's seemed to just fade away.
It wasn't a lack of interest, it was merely a part of growing up, new times, new places, new people, new things, all of these factors contributed to my own disconnection with my Tama, and i'm pretty sure the same basic reasons apply for most people here.
Great thread btw
(P.S. I just realise you'll be able to work out my age from this post lol)