Well, the obvious answer is: I can get them on the cheap because not many people want them. Why don't many people want them? They don't really cross off wantlists.... and the unlicensed cards were already becoming less and less popular.
Having a red 1/1 stamp on them does make them "rarer" than the original version, but not more desirable.
There is ONE ITG era Bill Ranford card I don't have (other than 1/1s). It's a 2006-07 BTP Double jersey with him & Grant Fuhr. Gold Version /10. I remember losing an eBay auction for a Vault copy, but I seem to think is sold for $35, or so. If one came along tomorrow - I would pay $35 for the placeholder, but that'd be about my max. I'd go higher for the "real" card.
