You're 100% on eBay having 0 seller protection.
I sold a pair 2012 Flight One Galaxies on there for $350 (I think the value on these has dropped since then, ask
@Brad Piff), shipped via USPS. Buyer claimed non-receipt even though USPS showed package was delivered, even called their local USPS site and they confirmed it...but because I didn't have the buyer sign off on arrival of the package, eBay ruled in their favor and charged the $350 from my PayPal account. To this day it's hardest I've been scammed. Filed it as a "stupid tax" and kept it moving, but man...left a bitter taste in my mouth for a couple years.