I'm fine with the idea of "just to have" - I've bought a number of knives for that specific reason - but I like my knives to usable, nonetheless.
My favorite just to have knife is a Swamp Rat Ratmandu. I've got several, in various configurations, and I think I've only used one of them.
I thought I had one being made by somebody here, but he never confirmed or responded to my last message; so I'm not sure & I haven't pursued it. (I'll probably make contact this summer to find out)
I'd probably also buy another Bark River Bravo 1-LT just to have...but I'd definitely go with an attractive wood handle rather than micarta, if it wasn't going to be a user.