OTOH if it discourages lounge use by those who don't legitimately have lounge access, this could be a good thing. If someone doesn't have a room with lounge access and isn't eligible to use the lounge due to elite status, having them sign the "bill" to the room and then be billed the "guest" charge or more IMO would be a good thing.

I've certainly been annoyed at times when a large group pays for one clue level room and then they hold the door open so that twenty or thirty of their friends can take over the lounge, of course instantly picking it clean and often moving furniture and leaving a mess when they finally leave.