How much $ will server rentals generate
I don’t know, but custom servers will solve alot of problems too. Since we got no ladders, other people can host their own tournaments while Anet works on features. Elite teams can set up skirmishes/tournies without worrying about paid queues.
If they created a 5th map that was just a giant circle with some pillars and made it only available in custom servers and allowed the owner of custom servers to make a deathmatch mode I think they would be able to make the arena group somewhat happy and pocket some cash. A simple arena design should be pretty cheap and easy to put out.
Some people might be mad they can’t get access to the deathmatch mode without paying but I feel like there would be enough semi-public servers that anyone would be able to play it for free if they put some effort in.