I recently gave it a limited try, to see what it was all about. Without much of a game to play and no significant return on investment (unless heavily invested initially) I didn't see too much point to invest more.
I think it's a great structure or backend for a game, there's a lot of potential in it. Even something relatively simple like being able to arrange your cards graphically on a plot of land, Sim City style, would do a lot towards making it a more compelling game. But I didn't find enough of a game to play to make investing more time or funds worth it for me.
Congrats on your profitable sale!
True.