I just took part - unknowingly - in a filthy rich, level 20 custom game on Cataract. It lastet 1:58 minutes. Please guys, I don't mind playing with unusual rules but at least announce them in the game lobby, better in the game name!!!
It's extremely irritating if you buy your usual level 1 stuff for 1000 gold only to notice that you could have bought all your good equipment from the get-go. I was one of the lucky few who realized it just in time and I had my build I wanted to play planned out pretty okay by now. Still, I think the opposing team felt cheated and rightfully so. Apoloogies at this point, I too had no idea what I was going into.
I think a simple little icon somewhere would be good to see if the game is set to standard rules or not. Maybe the host could get a button to set everything to standard rules from the lobby. (You often keep your settings from your last custom game or Pantheon IIRC. Sometimes the host doesn't notice and starts a game with a rule set he didn't even want to play.)