While that is a part of it, over the past couple of years I have seen way more early 20s collectors enter the market and for them the Copper Age keys are the big books tied to their youth. They have jobs now with decent disposable incomes to chase the funny books that are key to them, and it is not BA or SA. If they follow the trend, they will eventually migrate to BA, SA and GA books, but right now CA is what they are most familiar with and that is what they are chasing. It happened with SA back in the day, then BA, so it only makes sense that demographics are impacting the CA market now as well.
I think you mean people in their 30s, but I see your point.
No, the new early 20s types I see at shows are buying the CA keys, as the people in their 30s (me included) chase the BA/SA/GA keys. They did not grow up reading the books, but when they started reading comics, characters like Deadpool, Venom, Carnage, Harley, etc. were big deals so this is where they initially gravitate towards regarding keys. As those are checked off the list they will follow the same progression that the rest of us did in either going BA to SA to GA or SA to GA as they can afford bigger books.
This is correct. The mythos is first established, then the true seeker finds the grail.