So big deal, by keeping an instrument for years means what exactly?
One of two things...it either fits your needs almost perfectly and you don't need anything else...or, you're just too frugal to buy anything new.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.