When I asked my Harley riding buddy why he bought a Magic Fluke Flea instead of some other instrument..........he said, " Because it fits in my saddle bags."
He tried guitar, he tried mandolin, maybe some other instruments.....the Uke has stuck with him......
I'm three or so years into my own playing of the uke..........I'm having fun.......I'm learning......I'm playing tunes I want to play......gives me something to do that I enjoy during the long winters, I do play all year for sure.....
Tried a guitar when living over seas years ago....had no real resources or help so I did not follow up....have had access to guitars for 20years plus.....no real interest to grab one and play......
My wife is a life long musician.......kinda of a music snob at times.....she wanted me to take up cello........oh well......she usually puts up with my 4 stringer...she does like the sound of my Koaloha.....got kinda of angry when I bought the Godin.......she can pick them up any time really and out play me.....but the ukes are mine.....
If I stop I'll have to sell off my gear......but who wants to stop....happy to have found something I can play....with potential to improve as i put time and effort into it...
I think that part of it is the act of playing music......people want to be part of the music....not just a spectator......sure I can sing in my church or community choir.....maybe a community orchestra or band of some type, we have them here......we have a rich Scandinavian music and dance community as well as others I'm sure. Most folks are not making a living off the music....people want to play and play with others......If I can learn one instrument.....play it within the communities I want too....then I'll keep doing it....for some that's the uke.....for others the guitar....and so forth....I don't have to go pro to become the player I want to be....