Most I've ever owned is 9, then I trimmed the fat a little, either through giving away bats that were still usable or finally retiring trusty old faithfuls that would cower in the corner at the mere mention of going back in my vice for some more repairs.
Currently i have 4 bats, with the possible addition of 1 more.
My Powerbow Strauss LE is my saturday match bat, and probably will be for as long as I can keep it alive.
My Bellingham & Smith Supreme I tend to use Sundays.
My Vitas Cricket Lion Roar is my wet weather/friendly cricket weapon. Mainly used to bunt filth over the ropes, or to protect my delicate blades when it's wet.
My new Laver Reserve, well, I haven't decided yet!
Looking maybe to add a Slazenger V6 as I really like the pro tour softs. However i can't really justify getting another top end bat, so the V12 is not something I'm considering. The V12's I have in stock are beautiful though, tempting!!!