Why don't ATs make a lot?

I know everybody asks this question, but I'm genuinely curious. Is it because we don't bill our patients as often as physical therapists?

I'm currently getting my masters in athletic training and am wondering if I made the wrong decision. I love the field and I'm pretty good in my clinical rotations, but getting a masters in a healthcare field to work extreme hours for sub-60k pay seems ridiculous to me.

If anyone has answers about how to make more/what settings to work to make more/why we don't make a lot, please let me know.