Carson arrived at Anfield from Leeds for £1m in January 2005 and had a spell at Charlton in 2006/07 before Villa paid £2m to take him on loan for this season.
He has drawn the comments from Benitez after urging the Reds to be more reasonable when it comes to deciding his future.
He told the Wolverhampton Express & Star newspaper: "It's too much. It's stupid money really.
"It may be time to move but I don't know if anyone will agree a fee."
He added: "I don't think Liverpool are stupid. They know what I'm worth.
"They would've recouped what they paid for me in loan fees over the last couple of years, so hopefully they can help me out."
Villa retain first option on signing Carson permanently and he knows his future almost certainly lies away from Anfield.
"Liverpool have a great keeper in Pepe Reina and he's going to take a lot of shifting, but I've played football for the last two seasons and I don't think I'll be content sitting on the bench."
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