The compression of the top end of the ranking among active/once-active users is pretty extreme (or rather, I guess it's probably more a factor of just how many people are at the low end of the scale): I have around 1/4 your reputation but that's still good for "top 0.91% overall".

I have a similar experience though, I haven't been active for many years, and have a handful of very simple answers to common problems that still make the reputation graph pretty linear.