And even if they pay the same price, they’ll have different costs. I’ll gladly take all the free alcohol an airline will give me, but other people don’t at all

And even if they pay the same price, they’ll have different costs. I’ll gladly take all the free alcohol an airline will give me, but other people don’t at all! I sell some stuff on eBay. If you appear untrustworthy, I’ll spend more for tracking/better tracking on your order so you’ll actually get your stuff faster/more reliably.