It is percent based, like the vast majority of sales in almost all market sectors, because the amount of work is unpredictable. It largely depends on the fickle

It is percent based, like the vast majority of sales in almost all market sectors, because the amount of work is unpredictable. It largely depends on the fickle nature of your clients and those on the other side, as well as for example lenders messing things up, etc, as has happened to me recently. So pricing needs to take into account the law of averages, it can't optimize as much as would be possible if all people were strictly rational actors. Not one person likes high costs and there are millions of professionals attempting to optimize every day. There is plenty of incentive. It is a lot of money. But maybe walmart will come and make everything ~~better~~ cheaper and unbearable.