Others have covered the ground. My approach to selling begins with buying. The last time I bought something not in original shipping cartons it arrived on a pallet with bits of cardboard held together by twine. You could literally see more of the speaker than the box it was supposed to be in. Always keep your shipping cartons, always take lots of clear pictures, and always clearly state it will be safely and securely packaged in original shipping containers. These few things are worth big money in my experience. You don't have any of them.
My psychology is quite different than most. I do sometimes put a little extra in the price but mostly I look around see what there is and price mine to sell. Because you can be sure someone out there is watching and waiting (what I do!) and when they see the price drop they don't leap they drool at the thought of..... the next price drop! Price drops are weakness. They show you are weak, the market is weak, maybe the piece for sale is weak too. Don't kid yourself, that is how it works.
My psychology is quite different than most. I do sometimes put a little extra in the price but mostly I look around see what there is and price mine to sell. Because you can be sure someone out there is watching and waiting (what I do!) and when they see the price drop they don't leap they drool at the thought of..... the next price drop! Price drops are weakness. They show you are weak, the market is weak, maybe the piece for sale is weak too. Don't kid yourself, that is how it works.