Actually there are SOME people who do try going in even when there isn't already a group there.

I should know, i'm one of them.

Problem is there are not enough of these people, so typically you only end up with maybe 5 to 8 people, nowhere near enough to actually attempt the content.

So yeah, there are people who do go in even without an premade group in the instance, there just aren't enough of them to get anywhere.

Stuck in the entry hall every single freaking time