I would have to disagree. There being so many spar arenas give a lot of people ample times and places to boost. One of them being the beach spar as no one really knows of it.

I personally feel the only spars needed are complex/magus and underground (minus the elevator rooms as those aren't used besides for boosting)

Or just has one big building that has 10 spar rooms. Each room can be different
-streak spar
-fast spar
-practice spar
-100 hp spar
-hp+fast spar
-melee only spar
etc etc

This would go nicely with a one building that has all the repairs for guns as well.