Because their survival is not dependent on their career choice. Tech may pay more, but being a nurse is still perfectly fine. There are also more women enteri

Because their survival is not dependent on their career choice. Tech may pay more, but being a nurse is still perfectly fine. There are also more women entering the MD profession than men, and that pays better than tech, so there's even more room for people to move between fields based on a "natural" preference (if such a thing exists).