Earlier quoted context omitted.
Which in this case is zero, because eBay is rife with scammers preying on the *well-educated? Gazelle and Amazon present almost zero risk to the seller, hence the price differential.
The chance of getting scammed like this on eBay is less than 2% (maximum chargeback rate) Hence you are better selling 100 iPhones on eBay and taking the hit for two then sell all 100 on gazelle and not.
Selling on craigslist and gazelle does not solve the issue. It could be lost in the mail or you could be robbed. Il take a 99% chance at getting twice my money than a 100% chance of getting half. To each his own though./