I'll disagree:
Bryce Brentz is a career minor leaguer who is currently batting .230 in AAA Pawtucket and is 25 years old. Your card is available on a BIN on EBay as low as $5 and I doubt there is much action on these cards at any price. Any initial rush from last year is long gone
I will grant that Nick Castellanos has a better future then Brentz but even son he is not exactly tearing up the league either.
As of this morning he is batting .238 for the Tigers with limited power and no speed. Now, he is 22 years old and playing in the majors so there is some potential upside.
His cards are available on Ebay in a group of two for 40 percent of the current Beckett price.
If these cards were truly sellable, there would not be any left on the Bay
Rich