This is why I always make sure to uncheck 'In Progress' when I'm joining a party. That way I end up with a party that's still safely in the lobby.
But yeah, fine-tuning which elevators cost energy where would be a good idea. I've also been noticing complaints about it costing energy to just go into the lobby too, which I'm thinking could be solved without as many squatter problems (as compared to previous ideas to solve that), while it still checked your available funds before you went into the lobby, they wouldn't actually be spent until going into the dungeon proper.
Lol... I remember that you were so upset...! I experienced the same thing
Hmm it will take my advanced thinking to think of an idea... xP