Frankly I’m surprised that you are even considering this offer. Probably the idea of Genos messes with our minds. I think it’s suspicious that they want to sell it so soon in the first place. And 25% off is not that impressive even for a perfect but used keyboard; partly for the very reason that you never know for sure the history of used things.
I also think that it can be an interesting challenge to be with no arranger for a while. Sometimes when I want something very badly I start to question whether there’s a lack of something in my life or on the contrary too much of it… and the answer is usually ambiguous...