This assumes that the H1B's filed by the outsourcing companies are engineers your startup would want to hire. Unfortunately thats not true, most good quality engineers are almost never employed by these outsourcing firms. The general nature of their work also is mostly maintenance based , and it tends to attract bottom of the barrel 'engineers' who often couldn't find any other job. I am skeptical whether any of these 'engineers' would pass the interview gauntlet at many startups.