How about the customer being able to choose the different sound groups, like strings, brass, pianos, etc... and features, and either the manufacturer or seller, or perhaps, the customer downloads all these different things he wants. And voila! The ultimate tailor-made keyboard.

I got this idea from the early 1960s, when my father ordered a brand new car. In those days, he was able to tell the dealer exactly what he wanted, and a while later, the manufacturer would deliver the car to the dealer for my father to pick up. Nowadays, customers can simply download or activate all the sounds and features he wants directly from the manufacturer's website. Of course, the more sounds and features he adds, the more he pays. In other words, the hardware stays the same, but the software is personalized. And in the future, if he wants to add more, he's able to do so. Just an idea.