Eliminated players should not help those who are still playing. That's my opinion.
Okay, let me put it another way: let's say there's a Mafia team consisting of three new/not very good players and one Hostor. If Hostor is eliminated, the Mafia is likely to lose. However, if he continues to help them even as a ghost, the situation will change for the worse for the town.
Although, we (the Tampa players) actively discussed all the actions. Except for Amka; he kind of quickly withdrew and offered little advice, although sometimes he did.