If you have the programming skills necessary to develop deep learning applications, it should be assumed that you can also easily get a well-paying job so this isn't really even relevant.
Maybe you want to learn. Maybe you want to retain your current job because you like it even if it pay less then you could achieve, and you still would like to develop your other skills. Or maybe you want to stay close to your family, or in a place where they speak your mother tongue. Or maybe you just want to spend carefully your money even if you have plenty.