Why are some PS3 backward compatible?

Answer 1

Because in the beginning they did not have very many PS3 games and PS2 games had to be compatible to sell the PS3 game consoles. They later learned that making every game Backwards compatible was not possible because they would need the designers assistance. Some companies went out of Business or changed hands through merger and takeovers, still others wanted to design new games for PS3 and did not want the games to be compatible because of a loss of new sales. People that had purchased the compatible PS3s complained when every PS1 and PS2 game title was not perfectly compatible and did not care about what was technologically possible. Then when the Europe consoles were to be released they tried Software emulation to help allow the European region and format games to work with Backward Compatibility and had more games not working perfectly. Years later they are still working on getting every PS2 title to work with the original PS3s with 4 USB ports. Sony lost more on each of those original PS3s than the are selling the current PS3s for when inflation adjustments are considered. You should understand that if a PS2 title does not work on a PS2 the game designers are responsible for making it work, when it does not work on the PS3 then Sony must figure out how to make it work and then get the game designers to agree to changes.