I, for one, would be happy to pay for the upgraded Gandalf the White head. Even though I bought the original figure and I will definitely pre-order Gandalf the Grey once sideshow puts him up. I want to support/reward Asmus when they make gestures like this. I'd be happy to throw a few more dollars their way if they're going to keep going the extra mile for us.
Because sure, as collectors, we can be picky and demanding and outspoken and passionate, but we need to remember ... they don't have to do this. They don't have to replace heads or bodies or accessories when we find flaws in them. They could very easily behave like just about every other company out there and ignore us. The fact that they listen, interact and work to improve their products even after release (at their own expense, no less) is not lost on me.
They've more than earned my collecting dollar.