I totally agree with you, there are graduates from thousands of TEFL courses working all over the world, and no matter how good a is you can never make a good teacher out of someone who doesn't have the aptitude for teaching. However, when a school is presented with two teachers with the same aptitude and skills, and everything being equal, except one graduated with a Trinity, the other with a TEFL Int, which is the school going to hire? I know which I would choose.