(Actually, that's a good example of what to fear about any kind of office-relationship... If it goes sour, even if there isn't the really bad element of a higher ranking person dating a lower ranking one, it still makes an rreeeeaaallly uncomfortable workplace...)

But on that same vein, there's also many girls who are indeed very nice when they need something, otherwise, they wouldn't spare you the time of day...

I dunno... I almost prefer that to girls who are just naturally nice, because at least with a "user", it doesn't hurt as bad when you realize they aren't or weren't ever really interested in you... At least when they aren't nice to you anymore, you get a clear message that way, and don't waste any more effort & energy trying to discern their intent...