Simple, give newer players a chance to buy old Shop of Wonders items, coinciding with crown sales. I realize this can be "gamed" to some degree (if you want to call it that), but only if you're going to build a new char and spend a billion credits on it anyway.
So, I am an older player who did get a shot at all Mayan Crown items, and I love my platinum whistle, for example. I would be very sad if I were a newer player and found out that I *might* be able to get one by slogging through trying to assemble one through pieces (when they're available), putting up ads, constantly asking on market, and ultimately probably paying far too much for what *is* a neat little perk, but even when I paid 7 crowns for mine, I thought that was a lot for a neat little doohickey. I honestly hate the business model of Shop of Wonders anyway, but one of the worst things about it is that for new players, it does end up being "well, I'm a few centuries old, and I got mine"! This would just give those new chars a shot at some of those neat little perks, but doesn't really interfere with the (in my opinion awful but oh well) Shop of Wonders business model overall.