Arranger keyboard Are predominantly found in almost all the junior and secondary schools in the UK. These are the instruments that children are being don't want to play the piano keyboard on. The reason why you'll find many arrange a keyboards in music shops today is predominantly because the profit margin on them is smaller compared to the larger workstations. Very few customers will purchase top-of-the-line arranger unless they are professional musician or a very wealthy hobbyist. In general music stores are losing out in sales all round because of the Internet. Just because you don't see them in the stores does not mean that range of sales are falling.