I'd like to preface this by saying that I'm not an avid list pet trader. I'm not really sure where the scam narrative came from, but I don't have any up for trade and have a Wishlist of nearly 10 pages that isn't going to be completed any time soon. I would not be benefiting from moving any of these pets; I'd be losing out. This is also purely my opinion as a long-time player of the game, not as CS staff. And as always, you're 100% welcome to debate or disagree.
I think it's important to recognize that the old list was founded on literally nothing other than observing the trading community. I was there for it! I helped place some of the original pets, like the Zebras and July PPS. These pets used to be at the very top of the list. We didn't have any data to base these presumptions off of, either; it was 2010. No one really thought that CS would get as serious as it has. I never expected to be playing 9 years later, and I don't think anyone else really did either. We just wanted to create a list of the rarest pets on CS. Over time, these pets shifted from being recognized as high-value pets to being recognized as list pets. I admit that even I fall into that trap still, but at the end of the day we have to remember that the list isn't real. It's just a structure of organization.
I'd like to refute the Shima argument with the
Advent 2008 dog litter that comprised of the old pre-July dogs being released as adoptable pets. The BA, BMD, and Vixen are all a part of this litter, yet no one would be willing to swap any of these dogs for their littermates. The BA is on the September list because of demand. We know that it's worth the same as any other dog from that litter - there's no reason for it to be any rarer - yet no one is going to do that swap.
I don't think that the Shima is worth a list pet. But I also don't feel that a BA is worth a September '08 pet. Placements need to be consistent, and by favoring one pet over the other, consistency is broken.
My concern has always been for casual players. Not everyone has hours to spend every day trading and keeping up with the economy; some people only log in to CS once a week, or are returning users that have lots of older high-value pets that they want to trade off. I agreed with moving the BA to the September list because it lets people know, "Hey, you probably shouldn't swap this pet for its littermate because no one does that and you could get much more." We know that all staff pets have the same rarity, just like we can assume (we will never actually know, but it is very likely) that all Advent '08 dogs from the same litter have the same rarity. But people wanted the BA, just like people want the Shima and Malk mutant. For no reason other than how the pets look.
We know that a Shima Longtail will never be as rare as the pets that people tend to trade it for. It never will be. There will always be less 2008 pets than 2009 pets (aside from adopts available for more than one month) because there were less players in 2008 than 2009. That being said, I would hate to see someone from 2009 return to the game and get sent a trade trying to swap their Shima from some other pet from the same litter. I think that they should have the resources to know that their pet usually goes for much more than that. We all know that it's a bad deal, so why can't we have a formal place to acknowledge that? There's no reason to leave less active users in the dark about it. If I can get X for my pet, then I should be able to find that information easily.
I think that creating this list with the old structure in mind would be a bad idea, because I feel that many pets on the old list were placed inconsistently and without reason. It was founded in error, so it will only continue to contain errors if people keep valuing their pets in accordance with the old list. But at this point, we are never going to get away from things like "X is worth 2.5 nons" because that's the language our community has integrated, and nons have become a staple in high-value pet trading.
If a list is going to be created that satisfies all parties, it needs to be consistent in following market values. We can't just copy and paste the old list and then add high-demand pets next to old placements. I think it would be best to create a list starting with rarity data, then integrating pets that have high demand.
If you really want to add pets like the Shima LT and Dragoncat PPS, maybe you could add them in blue. Add a footnote that lets people know that while these pets aren't old, high-value pets, this is what people usually pay for them.
This shouldn't be a rares list; it should be a market price list. I don't think a rares list will ever work again, but I think a dynamic market price list could work.