on some of the other trading card websites, lists are maintained of : team collectors / player collectors / set collectors
TCDb doesn't have or need such lists, as any trader with cards to trade of a player / team / set, is matched with those who have want lists, and alternatively searching on players, sets and teams and we can find the information that way
but recently, I came upon a collector who goes for SN #1 / xxxx, and also a collector who collects cards SN # 4 /10 [their birthday]
and then as I was looking at a few of my cards, I saw they were SN # 1971 / 6000, and I thought, I wonder if anyone is collecting SN # birth year cards?
so I'll put it out there, would the admins approve of a special request list?
"Ability may get you to the top, but it takes character to keep you there." - John Wooden