I would say that the feathers being undesirable is a lot more complex that people not willing to let them go solely because the amount of feathers now are doubled. Like in 2015/2016 there was only the 7 of them, white being the most rare. And people would used to be obsessed with trying to own them, white feathers went for 40k tbt, pink and purple went for 15-20k, etc. Now theres about 15 or 16 feathers (I think?) including black and boss which are like the new "rare" ones, but nobody is really trying to get their hands on any of them if that makes sense.
Theres just a lot more collectibles now, probably over 200 different ones to collect. More than double how many there were when the TBT marketplace was at its peak activity (I was really really active during that time so I miss it :,[ ). Welcome bells were taken away also so theres significantly less tbt going around, so when more members flood the site, all the bells a user has will be thinned out. The active richest members now have about 10k tbt instead of 40k, so in the future collectibles like moon/love ball won't be casually sold for a lot of tbt.
The only reason the pokeball would cost so much tbt is because its price is already established that high, and nobody has sold one in at least a year to bring that price down. A reasonable price for pokeball is probably 8k tbt compared to the 20k it used to be, but you won't be seeing anyone selling it for that low because they would feel jipped.
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damn I wrote way too much lol sorry this is fun tho