You should check the sales chart. TOEE did do well, however it was a slow burner, and it took a long time for troika to see that money, the same thing happened with looking glass studios.
2d TOEE was an amazing game, the best D&D i have ever played. That it the only D&D game i ever felt really captured the spirit of D&D, and how one actual managed tacital sitution. Dungeon crawls are fine with there is a deep combat system to support them, just a lesser combat system, ie, planscape, Neverwinter nights 2 or arcanum can be supported by a lesser combat system. However i think the TOEE's are better games than the BG's and the planscapes, because I can go to any bookstore, and find great stories of all kinds. it much harder to find a rewarding single player tactical roleplaying experience. which of course is why TOEE has never left of my computer.