Single speed is like "back to the future" for many of us. When I was a kid, I didn't even know about geared bikes until an older sister dated a guy with a "ten speed", a yellow Schwinn Collegiate, if I remember correctly. After that, all geared bikes were "ten speeds" and I'll bet a pretty large segment of the population still calls them that, regardless of the actual number of gears.
I practically lived on my bike as a kid. I only remember one flat tire in all that time and it was self-inflicted. I tried filling the tire at a gas station and I literally blew it up. They guys in the station laughed their butts off at me. My ears were ringing for hours. Lessons learned.
Now, I ride a bunch of different bikes, but what has become my "go to" is one of my fixed gears. Not the most expensive one by a long shot either. Just the one that fits me perfectly and rides like a dream.