Im sure the first concern of the companies and the reason for not moving towards that is the risk of damage. shipping to and from the buyer, carelessness unopening the package or in setting up the speakers, and other factors are reasons that i could understand the ID companies do not provide this free shipping and free no strings attached auditioning. However, this hurts them if you ask me because for people like me who like security, and enjoy being efficient, well read consumers, it is impossible to fully know what your getting without hearing it in your home first, thus my hesitation to buy ID.
anyways, its a problem that will always be there for the ID world, and there will always be people who are willing and able to take the risk, but for those like me who like to make good investments in products which i can see, hear, and feel and verify that it is high quality before i reach for my wallet, the ID route is one of the last resorts in the search for speakers.