Thay have answered this though. I recall a dev saying KotOR2 won't be any more moddable out of the box than KotOR1 was.
I read that too, but it fails to answer the question of "why?" Especially when so many pc games are created to be mod-friendly so as to extend their life expectancy. Games, make that good games, that can be modded tend to last for years and maintain a strong presence in the gaming world. Just in the fantasy RPG (ish) genre there is the BG series, now the NWN series, and more.
I think that LucasArts, if they are the ones making the decision to not make dev tool available, is beginning to think of pc titles as they would console titles. Developers make a console game, market it to death, and then move on to the next project, never looking back unless it is to use a predecessor for marketing purposes.
Avid pc gamers want longevity from the game. I, and many avid pc gamers I know, prefer a game that will last longer than the next few months. PC gaming and console gaming are two different animals with two totally different markets. The reason why console games sold over $5 billion while pc games sold under $2 billion last year is because console gamers tend to be younger and always looking for the latest. The console game community is full of people who will tell you "I played that last month, I'm moving on..." This is the reason sports games are so popular on console, they update every year. People playing Madden 2004 right now are wetting themselves in anticipation of Madden 2005. PC gamers lean towards rts and rpg, partly because they play better on a pc, but mostly because those games offer the long term challenge and enjoyment pc gamers want.
This is why I asked, again, this question. "...no more or less..." is a garbage answer. I (and many others) would like to know the why's behind the answer, since this question has been on the top of many people's lists since KoTOR 1 came out on pc.