100 k it's a reasonable number, let's not exagerate
Well...it's pretty low number if you ask me...
For example: A game named Arcanum (not many have heard for it) have been sold in 234k co
pies.
The thing is that this game had a big piracy problem because it leaked before it's official release date, was released around time when Diablo was released too(!), and again, it's not so known among gamers. But still it reached 230k! And that was many years ago... Nowadays we have all the gaming sites, forums and s...tuff that will show the game to the masses and there is no chance that this game will be sold in less than 500k copies. Number of sold copies of Oblivion is measured in millions (forgot the number...).
But then again, I might be wrong...

...yea right... I'm never wrong...