Generally, older Krugerrands are sold back to dealers by retail holders, and they are generally notas clean as new ones - possibly even with small scratches.

Actually if you want a good measure of how hot the gold market is, look at the spread between Krugerrands and eagles. The closer they are, the hotter the market. The larger the spread, the less interest among retailers in buying. It is kind of like the difference between Junk Silver and Silver Eagles.

Also the new Krugerrands have to come from the mint and have limited supply, so they generally have a closer premium to eagles.

Lastly, occasionally a dealer will have a large supply of one item compared to others and they just want to liquidate inventory to raise cash for other items.