how many is too many
As i go low-end, it is easy to keep collecting. There is a saying @ the Ohio City Bike Coop about the number/type of bikes one needs, i'll try to dig it up.
I am concerned about my own mania for collecting/consumerism, but i try to justify it by maintaining a stable for friends and visitors to ride.
My bikes:
80s Ross road bike
70s Raleigh singlespeed
90s Haro mtb
1954 Hartog: Dutch 3 spd
80s Team Miyata road frame set (to be pimped out)
what I "need":
a serious touring bike
track bike or fixie conversion
beer cruiser singlespeed (the raleigh's too large)