Eyeing the price graph of that 3060, it might be "commonplace" among the population that built a gaming PC in the last couple months, or went all-out in the past ~1.5 years (availability not taken into account).

Most people I know don't have a desktop in the first place, and on average I wouldn't guess that desktop users build a new one more often than once every ~4 years. And that's among people who build their own; if you buy pre-built, you have to spend a lot extra to get those top of the line specs.

It's possible to now go out and buy this on a whim if you have a tech job or equivalent salary, though.

Unfortunately the 3060ti, 3070 and 3070ti are limited to 8GiB, so it is certainly not common.

In the price range it is the only Nvidia card with 12GiB and the 3080 starts at 10GiB.

So you can certainly get a 12GiB card without spending 3080+ money, but if you want any more power than a 3060 and keep the 12GiB then you would need to spring for a 3080 12GiB which is a big jump in price.