I have mixed feelings about the idea- the part of me seeking to create worlds where "best-of-the-best" level skills are correspondingly rare is all in favor; the part of me that wants players to get fair value for their character points is more conflicted.
For what it's worth, T-Bone posted an alternate pricing scheme a while back with exponentially increasing skill and attribute costs, and some interesting things this pricing scheme lets one do with defaults and styles:
http://www.gamesdiner.com/escargo