We've always had the choice to buy or not to buy.

There will always be people buying for the first time.

Arrangers are certainly not the only products marketed with incremental differences...cars, phones, computers, food products...the list is very long.

Seems to be a successful marketing strategy.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.