That's a good point - if you can't calculate the value of anyone but salespeople, then you can't calculate the value of salespeople either.
Calculating the relative value of one salesperson vs. another doesn't say anything about how much value either of them brings to the company, apart from the likelihood that one of them brings more than the other.
Calculating the relative value of one salesperson vs. another doesn't say anything about how much value either of them brings to the company, apart from the likelihood that one of them brings more than the other.