If you're not going to entering offers, why accept them? (eBay)

[Acer]

We're all on eBay to make and save a buck where we can. As a seller, I'm more likely to dicker over a dollar with an offer on a low cost item, if only because my margin is smaller, too. $1 may make the difference between profit and loss on a $30 item. Just the nature of business.

And lest you think eBay is some forsaken wasteland, you'll get the exact same type of lowballing and bickering over a buck at your yard sale.