Well I have multiples of many sizes, in some cases 8 or more! Here they are, Metric Combo, SAE Combo, DoubleBox/DoubleOpen/Distributer/Obstruction, Ratcheting, and finally the big **** that gets used more as pry bars in home use these days...
Some of it is logic that in many cases you need more than one at a time and you need more than one if you break one part way through a job (need a back-up). I used to have multiple boxes, work, Jeep, home, now they are all together at home, hence the big count of some sizes... Basically four and change drawers of wrenches!
I forgot to mention, sometimes there is a sale...