How many gliders is too many? I love my two, but I'd be lying if I said I don't sometimes think about getting more.

We have 10 and still have room for more lol. It all depends on your financial stability and living arrangements

We have 12, but one is going to be given away sometime.
we have a colony of 4 and 7.
depending on your situation, room and finances, I would say for me
a colony of 6 would be fine.
we have a second colony of 4 cause they are white gliders and my wife could NOT stop herself from getting them. But having ONE glider play room leaves problems with one colony smelling the other colonies scent in the playroom.

At the moment my rule for myself is no more unless some need rescuing and no one else can take them. In a few years I'd maybe like to have a few more. More along the lines of 5-6 max though, I don't think I could fit 10+ gliders on me without it being noticeable and I don't know if I could give each the quality time it deserves.