This is the good thing about shared facilities like this: the cost per-unit is really low because there's so many units to share the cost of just a few things like this (or an exercise room, a game room, etc.), and so much space is saved by sharing these things among hundreds of units. But most residents don't use them most of the time, so for the occasional users, they have it available for the 2x a year they want it, and the regular users don't usually feel crowded.