Interesting subject. Personally, I have two bats in may bag but only use one of them. The other is a spare for the odd net, or if my usual bat breaks. I have four other bats in my collection. Three are retired sticks - DF 405, Centurion, and GM Purist (broken but could be repaired). The other is a new bat, which is custom made by a good man at our club that has started to make bats. This is currently being knocked in and will take over from my current match bat which has a death crack going in a V from the splice down (however, performance hasn't been noticably affected just yet).
I only play league games on Saturday, a few T20 games, and net maybe twice a month during the season, so I don't see any point having lots of bats that I could use when they will only get minimal use. Having a young family and other interested means a drain on finances so as much as I would love to have some of the bats I see on here, it's not going to happen. I'll just replace bats as and when they are needed.
Saying that, I do drool over some of the bats on here, and would love to try out some of the modern designs coming out to see how they perform. So, I'm probably slightly jealous of those of you that get the opportunity to use / try so many different bats !!