Rule 0 in all of my gaming groups I've ever played in was that the DM gets final say....I've only been gaming for about 15 years though, and I've only had about 5 distinct gaming groups in all that time.
I'm thinking the definition of rule 0 must have evolved....At least it still vaguely resembles the original? Unlike 4e which no longer resembles D+D at all.
I didn't buy the RC, but 2 of my current gaming friends did. We rarely use it.
In my mind, the whole book qualifies stealth erratta...Since it says its the new rule, but it's not free. Basically WOTC trying to tell me that the rules I play with are no longer correct and I have to spend another $30 to know how to play the right way again.