I understand your concern, in what I posted.. But,
That was the cheapy "JT" chain and sprocket, that I mention was my first rivet set-up. My commute is exactly 840 miles between 2 jobs, and home, 7 days a week... Bad week, a little over 1000+. not including play time riding. ( my car broke down, about 7 months ago soo..every day has been ninja 250 day .. With maintenance every day)
So for it lasting 3 plus-ish months, doing the mileage math, it had a ton ( "before it stretched itself out"... ) i wasn't fussing. Just stating the cheap set did really well, but worded it wrong/not enough details.
I have a hard time communicating effectively.