I think the house rules for most vary wildly in implimentation, although there was one brief deal in one of the Nightmares of Futures Past game modules that I like to mention, where it references giving the characters a point or two increase in their fighting due to some specialized training for an upcoming potential battle with no mention of spending karma. I think a fairly reasonable compromise is to allow for a power or ability to increase by a point of a character pulls off a natural red feat, simulating that he's pushed it sufficiently to edge his boundaries back just a bit, or if you're one to favor any red feat go ahead since they're so expensive the karma spent to get a red feat in most cases balances things out. That way when the group's muscle man is forced to do a red feat on his Strength he gets a little stronger from that exercise, or the group's resident genius clears a red Reason feat on a difficult problem he gets a touch smarter due to all that cerebral activity.
"A shared universe, like any fictional construct, hinges on suspension of disbelief. When continuity is tossed away, it tatters the construct. Undermines it."
-- Peter David
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