There are no guarantees in education. Lots of people have degrees in engineering, finance, software engineering, etc. but are not working in that field, either because they find they don't like the work or because that field is not hiring in the years after they graduate. Incomes of people with any academic bachelor's degree are similar in the country I live in, because if you are bright enough and dilligent enough to get a degree in something reasonably rigorous, you generally eventually pick up the skills to find a good niche. But 'get a degree in this, it pays well' is risky.