Or assume that the new ones are so arrogant they don't think they could repeat the lasts mistakes. I've never heard from the GM's that they intentionally or otherwise disregard the last invasions activities so I certainly don't KNOW it is because we get different GM's. I've never even heard it confirmed that the GM's change with every invasion.
They change more than once per invasion.
That doesn't mean that none of them ever return, though. It just means that this is the third invasion with daimons in it, and if I remember correctly more than 4 GMs played them. I can't quite remember how many, though. I've pretty much always been in contact with the daimons, so any changes were noticeable. Also consider that there were more than 1 on at least some occasions.
Players get bored after a while, after all, why wouldn't GMs? A lot of things can be quite frustrating for them too.
