In some cases. In other cases some of us have been doing this long enough we've watched certain things damage or outright ruin what would have been otherwise decent GMs.
Plus these things are quite subjective.
For example, I outright ban PVP pretty much any time I'm running, I've seen it destroy not only campaigns but groups too many times.
Whereas some people (on this board and otherwise) have stories and stories of how much fun PVP has added to their gaming experience.