“Anyone can be bought; anyone is available for a price,” Jonathan Scharer says flatly. He ought to know. His Overland Entertainment Company has booked everyone from Beck to Bob Dylan for private parties and corporate gigs. Although Scharer will not discuss specific fees, he characterizes prices as “outrageous”-and rising. Just two years ago, the Eagles received a reported $500,000 to play for the financial firm Nomura Asset Capital Corp.; now superstars can command more than $1 million for about an hour’s work.