We have our first sale! I knew at $3.99 plus $3.99 for s/h, it might take bit and involve some re-listings, but a sale shows that at least there's some market here.
1993 ProCards Princeton Reds - SOLD
The set only cost $3.06 postage to ship to this buyer, so total profit according to
eBay Fee Calculator is $2.97. That pays for almost 5 of the 100 sets based on the purchase price of 60 cents each.
100 sets
2 opened / singles to be listed
23 complete sets listed on eBay
75 to be reviewed
1 set sold
$58.74 original purchase
$2.97 reclaimed (5%)