They've been making and selling Model 60s as long as I can remember, and I'm a genuine Geezer-in-Training. They've sold a gazillion of them under several different proprietary labels in the pre-Wally World retailers like Sears, Wards, Western Auto, etc., and even more through the "Big Box" discount stores.
I don't doubt that there're more of them out there than any other self-loading .22 ever. They've always been attractively priced and have a reputation for accuracy and reliability 'way in excess of what their modest cost might imply.
They don't have the massive aftermarket support that the 10/22 has and the Remington 597 seems to be getting, but the fact that you can still get one NIB for $40-70 less than their closest competition and the higher capacity of their tube magazine still make them a favorite for plinking and general "fun stuff" with budget-minded shooters.
Ya gotta love something that seems to give you that much perceived value for the buck.