It has to do with risk. You know what you're getting into, or if you don't, you're going to have to deal with all of your own customer complaints, confusion, di

It has to do with risk. You know what you're getting into, or if you don't, you're going to have to deal with all of your own customer complaints, confusion, dissatisfaction, &c. As soon as someone sells something to you, that stuff is their problem, and they need to charge a lot more for managing all the risk and expectations: documentation, customer service, insurance, lawyers to write contracts, lawyers to write letters...