Not sure if these BVs are exactly right, but I like an example from my Jack Cust collection.
1998 Stadium Club "One of A Kind" (/150)-- BV $40
2009 Upper Deck Gold (/99)-- BV $12
???
That is easier to understand a bit. As much as it SEEMS wrong, Think about this: If you pulled a card /150 back in 1998, it was a pretty decent pull. If you open a box today and DON'T pull a low # card, it's the exception rather than the rule. You can open 5 or 6 boxes of 1992 Donruss and not pull a single Elite /10,000 insert, or buy a box of 2010 Bowman draft and get multiple cards /250 or less