Known as "Spamalot," the musical has become a surprise blockbuster, commanding as much as $380 per ticket, the Sun reported Friday.
"Spamalot is utterly pointless ... full of air," said Terry Jones, who co-directed the original 1975 film.
The theater version, which bills itself as "a musical lovingly ripped off from the motion picture," is the brainchild of former Python Eric Idle, who reached a financial agreement with Jones before producing the stage version.
"If we'd known it was going to be such a success we'd have asked for a better deal," Jones said. "Eric is making more from Spamalot than the rest of us ever made from Python."