yeah thats too much, tell him he’s dreamin’. i dont know about prices where you are but a nice condition ms10 is about $800 (us) here. basically if it doesn’t track properly you are looking at a recap and contact clean session that would put you back $300 or there abouts and probably take a long time to find someone to do it for you. The ms10 filter has one of the dirtiest deepest bass sound available but it’s not the most useful synth generally. just think, one day if you want to sell it again it’s going to be difficult!