Should we change the spawn host limit?

Right now we configure a max number of total spawn hosts and a max number of unexpirable spawn hosts per user. The latter makes sense to me but the former seems to cause pain points, and may not be worth it since we do expire these hosts (although not for some time). Thinking of this rule though, 6 is pretty arbitrary. Do we still want this? (And if we do, should we make it easier to configure per user for exceptions?)