1. If you have allowed yourself to be stiffed several times on EBay then you are obviously not very clever at it because all the protections are there to be used
2. I think that this is wishful thinking on your part; it looks like you have not owned a KN7000 since new but you obviously love it and feel passionate about it but you have to be realistic
I already know of four people that have traded (committed) their KN7000 against a Tyros 2 it is a fact of life as good as the KN7000 is people move on and the same will repeat itself when the next generations of Korg or Yamaha appear in the coming years and who knows maybe Roland might get their act together.
I won’t be buying a Tyros 2 but who knows a Tyros 3 I may be tempted only time will tell never say never