I don't think there is anything wrong with this - where you have advertised it or the price . The problem is the current "state of the market" (I have the same issue with my Z1300 - and it's attempted sale) , I would guess that changing where you advertise it, may NOT suddenly result in the demand you may wish for. They are nice machines ,cheap to run and offer essentially depreciation proof fun .... every home should have one (approx).Before I have to advertise this elsewhere, I've added a link to try tempt someone...
'Hopefully it'll work'
Short video of a start up of Z900...