Another day, another letter from Carl Icahn attacking eBay Inc (NASDAQ:EBAY) board members, accusing them of conflicts of interest and of hiding behind their public relations machine to avoid addressing his accusations. eBay had challenged Icahn to a debate (which anyone with a passing knowledge of Icahn should have known he would accept), but when CNBC offered their channel as the public forum eBay backed down, which seems to have prompted Icahn’s 4th letter in five days. “Now, it appears that an honest, accurate debate with eBay Inc (NASDAQ:EBAY), which democracy calls for, will never happen because they would rather…