You have a price in mind that you want to sell for, everyone does, especially when you're in the business of flipping kicks. If you're reselling sneakers and complaining about lowballers all the time, it's your own damn fault if you say "make offers." The money you'd make off the occasional high roller is not worth the time you spend dealing with cheap asses. At least if you give a price, you can weed out a bunch of lowballers and save yourself some frustration.