Victory Conditions on Lage maps?

[Tyrant]

I have noticed that most net games are set up without victory conditions. For games with a half dozen or so players that makes sence, but for the 17 player huge maps, like Faerun, it seems to me that a single victor and a definative conclusion are very unlikely.

So why? Are there known flaws with the VCs, do people just perfer a free form end, or what?