I know a couple who met waiting online for reduced price tickets to Hamilton (this was when you couldn’t get tickets for months, but there was a “last minute” option if you were willing to stand on line at the box office) and then married.
So it’s not just “nothing I need that badly”. It’s often about like minds/shared interest/passions! I didn’t marry (or even have coffee with) any of the people I chatted with while waiting in the endless line for Shakespeare in the Park. But I had a lot more in common with many of them than I had with some rando guy I talked to at a bar when my friends and I did a “night out”.
An acquaintance slept on the sidewalk to get her kids into a magnet school. Kids weren’t being served by the local public school; couldn’t afford a private school. I could totally see doing that.