Last updated 10:01am (Mla time) 10/03/2007, Philippine Daily Inquirer NEW YORK–In spite of its global popularity, Internet telephony (VoIP), which is almost free for users, has not become a gold mine for its pioneers such as Skype and Vonage. Popular online auction firm eBay, which bought Skype two years ago for $2.6 billion, affirmed that message in a costly way earlier this week when it devalued the once-darling firm, knocking $1.43 billion off its value. The accounting move was long anticipated.