Not to beat a dead horse, but I don't think it's about wanting a discount. I think it's psychological and about fairness.
It seems logical to sell the license for $995 which includes one doctor and then charge $595 for each additional.
If I were a practitioner and it made sense for my practice to hire a PA, NP or another physician for five to ten hours per week, it would be hard to swallow paying the exact same amount as a full time provider. $595 is still a good chunk of change and at least the person who is hiring the five hour provider will feel a little better psychologically.
Of course, another way to do it would be just charge $1895 annually which covers one doctor or 100 doctors. Of course, then you are being unfair to the solo doc.
I think the key is getting that money every year which seems to come back to the whole subscription thing, but I have to err on subscription, because Jon needs cash flow each year and needs to know how much is coming in. I use Up-To-Date and Lexi-Comp, and I have to pay for it each year.