"The Big Bang Theory" started out about four smart and nerdy guys and how their women cope with their nerdy attitudes. Now it's more about marriage, babies and relationships. A lot has changed, especially the salaries of the actors and how much it cost to produce one single episode, according to a report by The Globe and Mail.

It now costs more than $4 million to make an episode of the TV show. That doesn't even include the salaries of the main actors. Jim Parsons, who plays the role of Sheldon, makes a whopping $1 million per episode and a lucrative deal with the network that earns him more money from the profits of the show, making him the highest paid actor of 2016 with $25.5 million for the year according to a report by Forbes. Additionally, he will earn more as episodes of the show go into syndication.

The other main characters; Johnny Galecki who plays Leonard and Kaley Cuoco who plays Penny, will make the same amount as Parsons. Meanwhile, the supporting characters; Mellisa Rauch as Bernadeth, Simon Helberg as Howard, Mayim Bialik and Kunal Nayyar as Rajech, will bring them closer to what the main characters are earning after they have negotiated a pay raise.

In terms of profitability, "The Big Bang Theory" is now pretty similar to "Seinfeld", which estimated to have generated more than $3 Billion so far. However, the most important number is the ratings itself. The show is the most-watched regularly scheduled prime-time program in the US, averaging 19.94 million viewers for the year.

With the high cost of producing just one episode, it would be a wise decision for the showrunners to make the next season to have just 13 episodes rather than the traditional 22 or 24.

How do you think "The Big Bang Theory" will end, with a wedding perhaps? Share your thoughts below the comments section down below.