Two completely different meta, of course the rarity will be different as well
Maiden is actually a strong card since the start in DL, but back when she was first released in OCG/TCG, she's already meh due to how strong the OCG/TCG meta was at that time
rarity doesn't mean much in tcg aside from ultimate and ghost rare.p and maybe secret rare. The other rarity value almost the same and the price cheap or not is based on their usage and if they are short printed, having collecting value or not.
Konami is going to favor P2W players not just because of profit, but also to keep down F2P players to the point where some of the latter end up paying.