"The Big Bang Theory," the hit CBS sitcom, is in its seventh season and its popularity has not waned a bit. The sitcom is a favourite of the advertisers, too as they are willing to pay $326, 260 (U.S. dollars) to get a 30-second spot during its airing.

The findings of the Adweek survey reveal that the 30-second commercial spot on "The Big Bang Theory" has a higher price tag compared to "The Voice," "Modern Family" and "The Simpsons."

"The Voice," which airs on NBC, commands $264,575 per 30-second, while it is $257,435 for "Modern Family" that airs on ABC and for "The Simpsons" on Fox, the advertisers are willing to pay $256,963.

Adweek reports that "The Big Bang Theory" is able to command such a high spot price because of its "monster rating." "Three episodes into the fall season, Chuck Lorre's sitcom is averaging 19.2 million viewers and a 5.6 rating in the adults 18-49 demo," according to Adweek.

The popularity of "The Big Bang Theory" has made Jim Parsons, who plays the role of Sheldon, Johnny Galecki, who plays the character of Leonard, and Kaley Cuoco, who plays Penny, the most expensive TV actors. They reportedly charge $325,000 per episode of "The Big Bang Theory."

It was reported in September, 2013 that Jim, Johnny and Kaley are teaming-up again to demand a hefty pay hike. They decided to do that right after co-actors Mayim Bialik and Melissa Rauch successfully negotiated their pay hike. According to reports, the two actresses now take home $60,000 per episode.

If Jim, Johnny and Kaley are able to successfully negotiate their pay hike and get a new contract, they might be earning $1 million per episode. The Adweek survey report has provided them a solid reason to successfully negotiate their pay hike. In 2010, Jim, Johnny and Kaley had successfully negotiated their pay hike as one unit.