Niche majors that actually pay off?

Information Systems. Related to computer science, but more focused on the software and data. More stats, less calculus. Also very flexible for job options, there's a lot of ways this degree can be taken because of the business school aspect. 

Going into a specific field because it makes money is a good way to waste money on school - pick something you're at least kind of interested in or generates that flow state for you (think about the kind of homework you get the most absorbed in). If you do something for the money but don't like it, you won't be good at the thing and you'll hate your life for 40 hours+ a week if you can even hold the job. 

It's honestly better to work a job that pays just enough and is mostly enjoyable than a job that pays a lot but kills your mental health and takes over your life. 

Just my two cents.