People build around a specific motor and once that motor is out of production they rely on buying them used off of people for spares when they break. As time goes on supply dwindles but people still need ones to replace as they break, so the power in negotiating a price goes to the people who have the few available spares and they can charge a higher price. Simple supply and demand.
Same thing happened with Speed900's. It's why i have a rule to never build a robot around parts I can't buy new.
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