Hm... Let me know if this is going off topic from what kind of feedback you are looking for esme... but my current thoughts on the matter is:
First off lets assume this poll is about your every day MMO, not one of those Rp centric mmos we so despertly are trying to find in this community
It depends on the game. If the gameplay itself is interesting enough then events really doesnt matter that much. Let us assume that we got an interesting MMO (hard to find..but just for the sake of the argument ) then I would actually rather have either a lower subsciption fee, more new content, a kick ass service for when my char gets stuck in the world, more focus on keeping gold sellers out of the game, more focus on creating a good community.... etc....
My thoughts on events is that they are supposed to be a nice surprise. If the game is interesting then I cant really see why GM created events should be required in the first place. Making them 'required' really shouldnt be ...well...required! Sure I like a good event during the holidays or at holloween or whatever but as this is (as i assumed above) about your 'normal' mmo then having these events doesnt alter the actual game world anyway, thus I dont really consider them required or a 'must have'.
Focusing on community feedback, good in-game(and out of game) services is more important when the events arent more exciting then they are in most MMOs.... Just my humble opinion
I voted "A nice plus" ... but if there was an option in between," A nice plus" and "They dont matter" I would have choosen that i think