Only you can know this.

Reasons for "needing" a bigger bike to replace a smaller one will vary from the entirely believable as circumstances change (see Alibaba and co above), to the honest to the honestly strange.

I used to believe that a certain badge meant I didn't need to learn mechanical stuff. I've reasoned that if 652cc allowed me to get to the top of Norway, 1085cc would obviously be required to go further, would wear better because it was less "stressed" and would give me more time due to less maintenance (shaft vs chain ). My local BMW dealers were pleased to confirm this (twice). A couple of years later I "needed" a 21-inch front wheel as I was going to become an off road God of some type (Yamaha agreed). This all pretty much wasted petrol money at the dealers and in the TT catalogue and didn't really achieve any more than I could have done by sticking with the first bike and learning how to use it. I blame Chris Scott for my stupidity, he obviously didn't know what I wanted to do when he wrote that book. .

I did sell an Enfield Bullet and buy the brick while shuffling jobs from one with a company car to one without that's 20 miles down the motorway. This verges on the sensible although I do miss kicking the green swine on sunny days.

If you want to hear real daftness find some bloke with a huge bike who's bought his wife a smaller one. Go ask if it doesn't make sense to have two the same..... .

Andy