Truth be told, I'm going to go out on a limb here and assume the room you're talking about is this one:
https://i.imgur.com/nuEiPIE.png
You can access it before or after the first boss, and their is a very good reason someone, or a group might want to go in there.
Fine Wax is an item only dropped in Haukke Manor, and
ONLY in a chest in that room. It's (i'm pretty sure) 50/50 that either someone will get 3 pots of Fine Wax from the chest in that room, or will get 1 potion. Each wax is +20k each on my server because they are used specifically to make the manor housing items, which can range from 50k all the way up to 200k each.
But really, none of that matters because tanks aren't the party leaders, and don't control the entire group. It's a group choice to clear the room, and you went for the "
I'm the leader" approach, and tried to hold 3 other people hostage. You got kicked because you weren't playing to be part of the group. Grow up. Tanks are a dime a dozen. You aren't special.