REC is a well known a famous Spanish horror film that was filmed using the hand held camera technique. Due to its huge success it was remade in English to attract a larger fan base.
REC was released by a small independent company who were called Filmax however due to the company only being independent they could not afford to release the film world wide so it was only released around Europe.
Screen Gems, a subsidiary of Sony then remade this film into Quarantine, bought the rights from REC and made more profit from both of the films as they were able to do more things with the production, exhibition and distribution of the film. Also, being vertically integrated they were able to profit from all three of these things.
The original film was directed by two Spanish men, Jamie Balaguero and Paco Plaza. Balaguero actually stars in the film which shows the passion that went in to the film to the fans and audience. It was released in 2007 and had a small budget of only 1.5 million euros as it was only a small independent company. Over all the film made the surprising profit of over 30 million euros which shows just how very successful it was.
Sequals were made as it was so successful and a third is in the making now which has a much larger budget than the previous three.
I would say that this film was so popular amongst its audience because of how real it looked. This is due to the hand held camera technique mentioned earlier. It attracted more fans as the realism scared people. The profit shows that this is what people like now, when to start with they weren't extremely familiar with it.
Quarantine was then made which also proved popular amongst its audience. This time the film was in English so for all the people who didn't bother to watch the film as they did not want to read the subtitles, they now didn't have to as they had it all spoken to them and this meant it had an even larger audience.
It was directed by John Edward Dowdle who is known for making horror films and released a year after REC was as Screen Gems who were the distributor thought that this would be the right time to make more money, and they did.
This ties in with vertical integration. Filmax did not have enough money to distribute this film word wide so Sony bought the rights and did it themselves and a year later a new film is made under Screen Gems, a subsidiary of Sony.
Quarantine is a remake that did very well taking into account that the original was such a hugely popular film. Its budget was 12 million and in the end the total profit for the film was 41 million which shows just how popular it was once again, and even more so due to the fact that it could be heard in English.
Synergy was used to promote the films so posters and trailers were made so people could see bits of the film and know what they were going to be watching.
Another feature which makes these films so popular is the fact that they are very similar, even down to the front cover promotional work for the films. This tells the audience that is doesn't really matter what version they watch, overall they will be very much the same.
To keep the element of surprise, Quarantine was changed ever so little so the original REC fans would have a something different to see and not get bored.
Overall all the factors in both films have all come together to make them very popular with great profits.