My father-in-law has five. One for the road in good weather, one for the road in bad, one for the woods, one for the shops, one spare. My mother-in-law has four. These include bikes for the kids that have grown up and moved away, a bike for visitors and a bike for spare parts. Looking in the garage I’m sure the bikes had gotten together and made baby bikes. There are trikes; there are three-seater bikes, there are bikes with baskets and bikes with caskets.
The age old maxim of needing n+1 bikes, with n being the number you currently have