I don't think the numbers mean much. After all, this stunt was based mainly on advertisement for the bundle page, and such advertisement seemed to be focused on techie websites (hacker news, slashdot, reddit). There is also the "finally, games for linux!" novelty that may or may not wear out quickly.
$250000+ just from Linux users is hardly meaningless. And even if it is just a matter of novelty, the results of this experiment could still influence other developers to start porting their games, and break the chicken-and-egg problem that prevents Linux from being a good and popular gaming platform.
