Having too much of anything is usually not good. More bikes equal more maintenance and more time spent trying to decide which one to ride. I find (and not just with bikes, but with virtually all endeavors) that people who are loaded down with equipment/paraphernalia tend to spend most of their time futzing with the equipment/thinking about it; and less time actually enjoying the use of it.

Nothing wrong with having lots of bikes or whatever, if that's what you enjoy- but very few people actually need more than two or three bikes.

I find that I tend most to enjoy an activity when I minimalize the equipment, and can concentrate on having one or two good items that I really like and which work well; and to which I can devote more attention to keeping in good shape- and especially so with something like a bike, which actually becomes an extension of your body.

Go for quality of relationship rather than quantity. Too many wives; too many children; too many cars; too many bikes, can all be bad things. You don't need a different bike for every little different riding circumstance. One skinny-tire bike and one fat-tire bike should pretty much be able to cover most conditions.