10%-20% almost sounds like not worth the hassle of adding a appraiser. That is equivalent to you needing 5-10 staff appraisers in the firm to make the same amount as working by yourself.
It might. But....
If I have no costs associated with a sub and the sub is generating all the work, 10-20% seems pretty good, doesn't it?
I haven't seen that "dream sub" yet (and likely never will).
Let's assume that there are costs that I'm paying:
Shared data sources.
Appraisal processing (if they orders are coming through my office and going out from my office, there is going to be some time/cost involved in that).
Let's say my data sources/software are $1,500/year. My brother is doing about 44% of the work; I'll charge him on a pro rata share for the data sources.
Let's say I'm processing the orders (they are coming to me, but I'm assigning them out). Let's say I charge $10 for that.
On average, I might have to co-sign 33% of the assignments he is involved with. I charge $50 for that.
I want to make 20% profit.
Let's assume he does 3 orders a week, 48-weeks a year; average fee is $400. I'm doing 5 orders per week.
You can run the math, but under that scenario I'm pocketing $11,520/year in profit (this excludes the co-signing fee). I'm reducing my expenses by $4,400 (separate from the profit and includes the co-signing fee). The fee split to my brother is 72%. He grosses $41,680/year.
If I am co-signing 2/3rds of the work, the equation changes to $11,520 in profit and my brother is getting a 68% fee split. I'm reducing my expenses $6,827/year and my brother is making $39,254/year. (The increase in the expense reimbursement is due to my co-signing more appraisals; another might consider that "profit" but I'm counting my time and liability as an expense).
If he gets up to 4 assignments per week under this scenario, my profit increases to $15,360/year and I've reduced my expenses by $9,019/year. He is getting a fee split of 68% and earning $52,421.
In the best case scenario (best for me) I've reduced my expenses by $9k per year and earned a profit of $15,360. The "total" fee split to my brother is 68% (so I am taking 32% of the fee).
I don't think that is unreasonable, but I can appreciate another might think it so.
The above doesn't consider shared office costs. In my case, because of my office configuration, if my brother wanted to have a desk at the office (computer, phone, access to the office manger for assistance, copy machine, etc.) I'd likely charge a "desk charge" for that.