I'm a little scared to write I still think I have a few more than I need.
I only use one or 2 max with the bands so really don't NEED the others, but I do enjoy having them and they are always out on the stands at home to use.
I think 4 would do it for me a fretless, P bass, my Wal and the (gassing for) Jaydee
Each to their own I guess.