I suspect it could also depend on the insurance and if you're billing on the medical side, mental health side, or both...?
But using Medicare rates, let's say you do all your own testing and your average eval is: 96116 x1, 96136 x1, 96137 x5, 96132 x1, and 96133 x3 (including your 1 unit for feedback). That works out to just over $770 per eval. Take off about $100 if you instead bill 2 units of 96133.
Extrapolated at 5 evals/week for 48 weeks/year, that's $185k. Assuming 100% show and collection rates (which of course won't happen). For 4 evals/week, that's $148k.
If you use a psychometrist and do 1 unit of your own testing + 5 more units of their testing, assuming I set it up correctly, you're looking at about $746 per eval (or again, about $100 less for 1 less unit of 96133). At 5 evals/week, that's $179k.
Private insurance rates will probably be a smidge higher than the above.
So basically, it can be tough to make a decent living without a psychometrist when you consider taxes, expenses, and a handful of no-shows. Particularly if you plan on seeing less than 5 patients/week for assessment. If you do at least 3-4 evals yourself per week and have a psychometrist knocking out 5/week (or have two psychometrists each doing 5 evals/week for $179k a piece annually), that seems more doable. Although that's a lotta reports. And with that many patients coming in, you'd probably want at least one support/administrative staff person (i.e., not just yourself and the psychometrist).
But I could also be way off on those numbers.