Saying, "Oh, I have a great idea! What if we have quests, and when you beat the quest you get a new item!!" is not an idea. Not to mention simply suggesting more quests and content is not that helpful either, chances are the staff that care are trying to get actual content done... but real content, especially quests, are very time-consuming to get done; and for what? You can put months into getting a nice quest done but decent players can complete them AT THE LONGEST in a day, and bad players will just have other players or tutorials walk them through it. Months of hard work useful for an entire day. MoD was released and literally a couple of days later people were whining for more content.

Then you have the problem with what Rufus said, where players want content while they wait for more content. There's always some holiday going on, and players always expect **** done for every holiday or time of year, so you have to put off time from actual content to keep players happy with trivial stuff like that.

TL : DR? It's harder than it sounds. While it's pretty easy to come up with vague ideas, the actual workload involved is way more than any of those people can comprehend.