Whoa whoa whoa. Changing sound is not selling out. You're telling me after 25 great years of black metal darkthrone going punk was selling out? How bout Anathema? There really is a major difference in the two.
My post was more or less a tongue-in-cheek stab at the mindset amongst metalheads that changing sound is selling out, with me giving some examples of bands where fans have reacted this way.

Of course it doesn't happen all the time, but it does happen.