The T206 set is the perfect storm. I think it's just as likely that 3500 more cards on the market is more likely to increase interest and therefore prices than it is to decrease because the impact to supply is minimal on a per card basis.
There are several reasons T206s have enduring popularity, a few of them being:
1) There is enough supply that on some level they can be actively collected
2) They are a pretty card
3) There are a lot of variations
4) There are some truly difficult/iconic cards
5) They are old
6) They have an exceptional player selection
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