(in public). I would say with only 4 pairs available some serious collector would consider
this as a possible investment.
The important question is, in 5, 10 or 20 years when you consider selling them will you
at least get your money back?
It's possible if Bitcoin, the company and athlete behind this snickers become far more popular. But AFAIK Bitrefill and TNSID are small company while many government hostile against Bitcoin, so IMO it's unlikely.
Bitrefill is "small" in terms of Apple and Google. But very large in the BTC world: https://www.bitrefill.com/investors/?hl=en
Spencer Dinwiddie (TNSID) is big in the NBA, beyond that it's tough to really gauge the size of what he invests in unless he tells people.
-Dave