For me, it's the history of it. I collect antiques anyway. not nessisarily expensive antiques, but just anything that appeals to me whether it has a high monitary value or not. With Ukes, and other musical instruments, I love the history it holds. I like to play something that someone else played with their heart and soul maybe 80-100 years ago. I like to think and picture in my mind the original owner with it in their hands, smiling and playing. Who they played for, etc...
Even tho it isn't uke related, but I have a turn of the century player piano that I traced the history back to being in honkey tonks in Texas, and then ended up in one in California. It isn't a very ornate, "pricy" piano, but rather sort of plain looking, and actually pretty tattered looking, BUT still works as it did 100 years ago. I love to play it with it's plinky rinky tink sound and think about all the floosey's, and flapper girls sitting accross the top of it, maybe the old man in a bowler hat bouncing up and down playing rag time on it. I like to imagine the beer, white liqur and all the other drinks that were spilled on it with everyone crowded around it singing drunk lalabys.. Anyway.. It's fun to think of the past, and to have that real link with it..
That said, and this has came up on the forum before, but sometimes people hear it and love the piano, and then ask me why I don't refinish it to make it look better. I considered it several times over the years I have had it, but just can never bring myself to do that to it. I look at that as erasing it's history.. I love it in all it's honky tonk abused glory..