I'm sick of the fees on Ebay it's become totally unprofitable for some items due to the massive fees. I use Facebook marketplace but that's more for local sales.
With crypto Ebay you could have near zero fees and have a decentralized marketplace model. I know there are things on TOR etc, but I just wouldn't trust it tbh..
Why do you presume that crypto marketplaces will have zero or less fees than traditional markets? I am sure crypto related ecommerce websites will have more fees when coupled with transaction fees which will also eat into your profit margin.
Decentralized model is not always sustainable when it comes to an online marketplace that sells physical goods. Also the trust factor matters a lot! Don't stay under the impression that everything decentralized is good!