Good question! I have enough interests to keep me solitarily occupied for sure forever. My main concern about interacting with others is work-related. I always, always knew something was 'up' with me but when I missed a promotion over a dozen years ago, being 'on the spectrum' hit me in the wallet hard, enough to make me ill. I can't remember how management put it exactly, but you didn't have to read between the lines too hard...
So from then on, I have been attempting to pass as NT with some success and more than a little spectacular failure, some of which would be funny if it wasn't me living it.
I'm a little embarrased to admit it here in writing, but for me it's mostly about money. There, I've said it... But being isolated socially can be inconvienent from a practical standpoint too.