Well, I recently got married, and my wife loves games, and she will play dominion with me, but frankly, she isn't as good as me. She still likes to play, just not that often. She definitely prefers other games. (Lords of Vegas and Castles of Mad kind ludwig are favorites in our house)
As for why my friends lost interest, I think they just got tired of it. They didn't quite get how cool this game can be.
I have tried adding new cards to my collection, but Lots of the guys I have played with don't like adding complexity to the game, so they don't love learning the new ones. One of them still insists that buying golds is always the best idea
I like that idea of having a tournament night. That sounds great. Thanks