Thanks for the laugh, elm!
"Reprint" has such a negative connotation - I prefer re-issue, and in very small numbers. If it makes you feel better about it, let's just consider it a scarce cream back parallel set issued 7 years later! On the plus side, almost no one knows the difference, so if you find the first 68 cards from the 78 set, you can probably get them for the price of the much more plentiful 71s!
Bob wanted to issue a full new set in 1978 with all new artwork, including the additional cards, in commemoration of the 10 year anniversary of his first set, but somehow we ended up with just 7 new cards. Another unsolved mystery!