Brave or naive? What's the problem with eBay AS a seller? OK, I'll tell you one problem, failure to pay immediately. Just closed an auction on eBay for $581 for an IP7 (128gb). However, I had a novice buyer (zero rating) who has not paid as yet. If it's not paid for by tomorrow, I'll relist it. I don't see any downside to eBay selling wise other than failure to pay, but the phone doesn't ship until Paypal reports payment. I've sold all my IPs since the IP3 on eBay.
Anyway, tomorrow it will either be a second chance buyer or I'll simply relist it. No big deal either way on the selling side. On the buying side, it's a whole different story, but I would never buy a used phone on ebay.