What is an OG collector, anyway? I bought a couple dozens of Casascius from Mr. Mike Caldwell himself at end of 2012. Am I an OG?

Yes :-)
I know of a few. Mostly they have all the coins they want, they will NEVER sell them, and they have enough money now to do whatever the fuck they like. Blazed had what, like 40k coins at one point? He's a billionaire, doing billionaire things I imagine.
Don't know if he is that rich, but I know a lot of collectors that picked up a lot of loaded items early 2020 when
BTC was low and are now waiting for the next price drop.
With the next drop being an individual amount for each person.
I actually have just not been 'moved' by any new collectable lately. No idea why, there have been a bunch of "that's cool" but not a lot of "I MUST HAVE THAT"
-Dave