Alright then, starting over

I price my stuff the way I do to avoid lowball offers. Whenever I sell something, I take a look at the going rate and price things on the bottom end of that ... and I like to throw in a bonuses to sweeten the deal. That's exactly what I did here.
When somebody offers something at a good fair price, you should recognize that instead of immediately trying to get it for even cheaper. I'd bet there hasn't ever been a s300 sold for $700 shipped, probably only a handful sold at the price I'm asking.