According to this page it is still required. it seems shoddy enforcement is the issue here.
http://pages.ebay.com/help/policies...rstamps.html "Single coins listed in the Coins & Paper Money > Coins: US category with a starting bid price, reserve price, or Buy It Now price of $2,500 or more must receive a numeric grade from an approved grading company, and the numeric grade must be included in the listing."
"Listings for raw coins must follow these guidelines:
The starting, reserve, or Buy It Now price for the coin is less than $2,500."