I used to sell items on eBay but I'm back to Craigslist and, for phones and other electronics, I've found Swappa to be a decent marketplace. On the latter products are moderated lightly for validity and, just like eBay, it was easy to build up a very positive reputation by selling items that are clean and have been taken care of well. I do go to eBay as a shopper for random items. But generally if it's on eBay I can find a better price by spending a few minutes looking for a site that specializes in those items.

I lost trust in selling on eBay due to buyers that have tried to scam me in the past. Not sure if it's still that way on the sell side for individuals but I felt like, for a while, eBay was favoring high volume users vs being fair. I sold some SFPs that were way under market value about 6 years ago and had serial numbers of each unit in the auctiom. A guy bought them to resell in his shop a couple states away and he claimed they were defective when he received them. I told him to prove it in a switch showing the serial numbers and the error condition he claimed. He wouldn't do it so I told him to ship them back. He shipped me units with way different serial numbers but eBay still gave him his money back and charged me. That's the last time I sold on eBay.