Several times now I've entered a tier 2 dungeon only to find I'm stuck into the T2 lobby with some T1 who can't enter. The worst part about this is, the other day this happens to me, the Tier 1 guy leaves and then I'm sitting there and the loading screen pops up and i end up back in Haven (meanwhile i was the only one in the lobby), boom goes my 200 CR, may not seem like much but it's happened 2-3 times now and it's simply fustrating.
My suggestion is DO NOT COLLECT the required Crowns until you venture DOWN the elevator, the same as energy is collected, I see no reason why I should pay 200 Crowns to get into a lobby which can potentially crash/kicking me out etc etc. I for one am sick of losing crowns to things like this, this simple change would solve that.
you could always unlock the gate by goig down from t1