Dude, preach on brother.
If a guy like Henrik Lundqvist, a great goaltender of this generation but minus rings/post-season hardware, can have a PSA 10 YG of $500, shouldn't someone, legends, like Hasek or Brodeur who were every bit as good, even better arguably as top 50 players and have post season hardware to boot, how can their PSA 10s only be worth $200 to $400? Lundqvist has fewer YGs than Brodeur's Score and Hasek's UDs, but Lundqvists YGs are way easier to get 9s and 10s out of than the 90s guys cards so in my mind they are equivalent, pop-wise, for high grade.
So these legends's cards, currently spiking to $200 to $400 a card, are actually very underpriced, maybe by as much as half...the real prices should be more than double, maybe more than triple for the RCs of these great players. There's no way in my mind a guy like Cale Makar should be worth as much as he is currently when you can get Scott Niedermayer, a guy with all of the personal hardware and post season hardware, and is everything you hope Makar can become, should be worth a fraction of Makar...especially in high grade.
As a somewhat side note, using the Topps and baseball definition of rookies, I believe a player like Scott Niedermayer should not only have 90-91 UD Hi, WJC Team Canada RCs in English and French, but also all of his 91-92 cards that show him for the first time in his NJ uniform on NHL ice are all considered significant RCs, such as his Topps and OPC/OPCP, all of his Pro Set cards, his Score and Pinnacle cards, and his 2nd UD cards should be triple digits in PSA 9/10. (And they are going for that much)