Used good need to have a *huge* discount. If you look at the utility, when I see something for sale on craigslist,
I can't just click "buy it" and it shows up at my door. So I need a big discount for that.
It's usually badly described and photographed, so I have to do a bunch of research. Discount.
I can't pay with CC at all so I have to go fetch some cash. Discount.
The seller has a 50% chance of being a flake in some way, like telling me its been sold after I show up for my appointment, or putting up the wrong item. Discount.
If it's broken or wrong or whatever, I can't return it. Big discount for this.
There's always an information gap problem when buying used - the seller knows more about the item than you. This fucks you with new items too, of course, but it's worth with used. eg. there's a chance that it's in worse condition than you know. Discount for this.
Even if some of the bad eventualities don't happen on a particular purchase, the price needs to be discounted by the probability that they happen times the cost to you when they do. eg. if your $100 purchase has a 10% chance of being fucked and worthless, you need a $10 discount on all purchases PLUS a discount for the trouble in that event, which is probably another $100 times 10%, so $20 total discount.
The result when you add up all the factors is that something that sells for $1000 new needs to be under $500 or so for it to be +EV to buy used. And it just isn't. In fact it's usually over $800. Used prices are uniformly too high.
Part of the problem is that the price of goods has gotten so out of whack with the price of labor.