You probably could have sold this 10 times over if you offered delivery. I realise that you're not at home during working hours, but the courier can collect from a work address, or you could perhaps leave it with a neighbour to be collected?
There may even be another forum member who lives close to you, who could collect it and pack it on behalf of the buyer. The buyer would then just need to arrange the courier to pick it up from them.
Just trying to help you sell it mate - it's a great bike and a fantastic price, but the fact that it's collection only is going to put a few potential buyers off