If you want to make this long-term, look at the integrity and capability of the person you are working with. The split can be renegotiated. Payment isn't just in terms of $. Payment is also in terms of quality of life and enjoyment of work and learning.
If you get busy enough, you won't have time to do your own prior authorization. I sure don't have time for that and the stuff I do is really high yield. The support staff will make or break your practice and the amount of money you will make. It doesn't sound like the support staff will be doing much for you in this gig.
As
@TexasPhysician said, high split of a low collection amount is still a low pay.
To reduce the risk of this flaming out, don't make this your only gig. Do other things and grow this if it meets or exceeds your expectations.
By the way, if you're looking at maximizing income, it depends on how you practice. If you are slow and can't see many patients a day and are terrible at retaining patients (due to inability to build rapport), you might make more from a salary position. If you are efficient and patients come back to see you and know how to bill, it will be from a productivity-based model. It will be from productivity-based models where you are able to earn more than $200 / hr. But there are a lot of components you have to get right.