The on-again, off-again buyout talk concerning the most popular video site (more than 16 million unique U.S. visitors in July) picked up steam this week when Sony Pictures grabbed the much smaller Grouper for $65 million. That's pocket change compared with the $2 billion that some say YouTube might fetch. But who would be interested at that rich price? Robert Routh, an analyst at Jefferies & Co., says the biggest media players might prefer to spend that kind of money developing their own digital sites. YouTube isn't saying whether it might be looking.