I"m not going to comment on whether they're worth actually doing, but I'm really going to question all of the people flat out saying they "don't work." How do player's ingame actions not influence dev decisions? If a certain class is way overplayed or underplayed, isn't that going to warrant a look into why that is? If a new dungeon or area comes out and players, for whatever reason, aren't running it, are the devs going to go "well, they're ingame either way so I guess it doesn't matter"?
If this were about any other topic, most people would readily agree that player ingame actions shape dev decisions. But now apparently I'm expected to buy that it doesn't matter when players choose to drop whatever normal ingame activities they typically do (which, depending on the size of the server, can have a noticeable impact on group availability), gather in one place, and talk about how terrible "insert_thing" is and how this is happening entirely because of "insert_thing." And, in the case of DDO, this happens for multiple days in a row. WHILE people are talking about how they're canceling subscriptions and vowing to stop spending money in cash shops (turns out that logging into a game to yell about things you don't like and "voting with your wallet" aren't mutually exclusive things). Apparently this will never have any affect on the devs.
Seems a lot like a few months ago when everyone was mocking all of those video game related petitions that were popping up and saying they don't do anything. Except for the times when they do, or when developers/publishers came out and explicitly said they pay attention to that sort of thing. Apparently the idea that content providers pay attention to people saying they will pay money for "insert_form_of_content" is super controversial.