The purpose of the bike is enjoyment - at least you have specific and varying uses (excuse's) for more than 1 bike. I have all the same bike mostly.
- club/daily/century or Main Road bike
- Cool Steel Bike/HTFU bike/
- Mountain Bike
- Cross/Hybrid
- Rain bike

The main road bike is really the only road bike I need, it is relatively new, has a nice component set, is super light and a joy to ride. I also ride trails so I have a MTB; I started with a Hardtail, perfect for the fire trails where I live. Then I saw lots of people on full suspension bikes, I added one to my fleet and began riding more complex trails. I got the old steel bug and bought and sold a few bikes before I found "Cool Steel Bike." This bike is fun, a bit heavier than my Main Road bike and has HTFU gearing. I cannot ride it on big climbs. I then discovered how fun it is to ride my fire trails on a Cross bike, a great workout and it really helped my climbing legs. So that is four useful bikes, with specific purposes. Unfortunately the Cool Old Steel bug doesn't stop with just one bike, I am building up two more of the things. And then I will be building up a nice steel hardtail. And then...

So I looked at the bikes and noticed my Cool Steel Road bikes were not of the same era! I had a '70s steel bike, an '80s steel bike and a '90s steel bike - My Main road bike is '00s so it all makes sense.

Then there is the so-called "Rain Bike". Shouldn't this be an Aluminum bike? Or is it just an older bike. I have the oldest bike owned by me targeted for that roll. It could also be the "Grocery Hauler", if I did that sort of thing. I think we all see the categories blur, the main thing is to get use out of the bikes. For me - if I find a bike simply doesn't get ridden - decisions will have to be made. Space and investment will be the mitigating factor.