No, but I do end up with overlapping niches, because most people have a type of local riding, and want n+1 bikes, so end up with at least some similar bikes.
I would consider another On-One Scandal to supplement my singlespeeded one, but then that would end up overlapping with the SS, the FS trial bike, and the gravel bike. A better option would probably be ditch the gravel bike and get a proper XC race style bike to cover things like evening trail center blasts where I’d be more bothered about covering the ground quickly than just the fun sections, and ‘gravel’.
An expensive ‘spare’ seems silly. The odds are by the time you break a frame it’ll probably be superseded by the next big thing anyway so then you’re just left with an unfashionable frame to sell. A bit like those 26″ die hards that bought spares, yet if you go on ebay the problem isn’t so much a scarcity due to demand, but scarcity because it’s nor worth people even listing it.