lol, I have been doing this for a long time so Im not sure how you can say "you are in the wrong business"....its amazing coming from a newb who joined here a few months ago...
When you say the game has changed now, not a lot of has happened with the 3D market in the last few years, and I have been following since it started, have a look at the 3D threads on here, thedomains, DNF and successclick, that will make it a little clearer for you.
Making xxx off a domain, or even x,xxx, is a little different to making a xxx,xxx sale as you mention above.
You only have to look at DNF to see you only just bought the name a few months ago from the owner, so not a lot has changed in last few months
Good luck though, I certainly hope you sell it for that