And if Yamaha don't rigorously enforce their own MAP pricing structure (it would be simple to pose as customers and see what is REALLY being quoted), and other manufacturers too, perhaps it is time for the manufacturers to place product in the stores at no cost to the dealer until it is sold...?
They MUST be losing sales due to unavailability to try out (not everyone can afford that leap of faith, or want the inconvenience of shipping a keyboard back to the dealer). It seems unfair to the dealer to make him BUY something, and then do nothing to protect him from dealers willing (or able) to turn only a slight profit and benefit from increased volume at the expense of the brick and mortar store... In violation of the MAP, at that.
Time to drastically reduce the cost to the dealer of just being able to SHOW the product, especially as the manufacturer encourages (by inaction) others to benefit from that dealers willingness to put his money on the line...
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An arranger is just a tool. What matters is what you build with it..!