Postdocs are intellectual trap, very less paid and just another stage of exploitation. Either you should be the product of Ivy League or top 20 schools with very good publications and teaching experience, otherwise, doing Ph.D. is just a ladder to come USA after masters, absolutely non-sense. I have a very bad experience too. You will be paid half than a master's degree, my salary was decreased half after finishing Ph.D (even with engineering degree). Shame. You can't apply job for master's degree as you are overqualified. Just simple non-sense in this intellectual world.