I get what you're saying and yes it would raise extra money.
Problem is that Mike Gate is for accessible needs customers, most guests go up cow lane and enter the arena via Cow Lane Guest entrance.
The more people you're pushing into Mike Gate, the less accessible it becomes and also a potential security risk opening the gate more.
Can't really put another lane for the Lounge as there is a burn between green and the production road.
Also wouldn't work on the other side of the burn as you are also eating into the Camping Plus space, and that area floods bad on a wet year as it is.
But I get what you're saying about the walk from town into the arena.