It's all "Well I bought this at Walmart for $300 on sale...and the fork is on backwards, the tires are flat, the chain is rusted, but I put a wide seat on it so I'll take $275 firm" and "This bike lists for $4000, which means you could probably effortlessly get last year's for 30% off or approximately $2700, but I put a new stem on it, asking $3700, seems fair."
A normal bike priced remotely fairly should fly.