Bare painted metal looks fine. But it doesn't look fine after you load up motorcycles and have coolers and camping gear sliding around.
Doesn't bother me if people want to debate the merits--argue all you want, but this isn't going to sway my decision. I need a liner for my usage, because I don't want to to get all rusty.
Now, I'm pretty new to this forum and nobody here knows me, but for a bit of background, this will shed a little light: I have a small collection of rare-ish older sportbikes. Mostly Ducatis and most I've bought relatively cheap and restored/resto-modded to exceptional condition. While they're all 20-30 years old, they look cherry. But in spite of storing them (and working on them) in my living room, they all get used, and that means Deal's Gap and race tracks like Road America, not (just) trips to Starbucks. I've got 26,000 miles on a bike that was 1 of 500. I take great care of them, but these (and the Raptor too) are just things. Beautiful and purpose-built, but things, just the same. They are not investments, they are meant to be enjoyed.