I mean this in the nicest way but if your only motivation is money for those specialties then you really don't know the work entailed to get to them and actually work in those specialties. You will likely change your mind as a med student as most do.
Also, as another poster said, your GPA and MCAT are very mid for an MD acceptance and I think that's reflected in the single interview.
Lastly, if you had no intention of ever attending the DO school, why even apply? You should take it, work as hard as you possibly can, and move on with your life. Going the DO route isn't going to be the thing that prevents you from doing what you want. That's on you.
EDIT: I got off a single MD waitlist, on my second cycle, at the end of May and I had better stats than you. I wish I had applied to a bunch of DO schools and my year would have been so much less stressful.