No chargebacks mean that sellers have to work towards building trust.
It is not necessarily a bad thing, the bad apples will get weeded out eventually.
Bitcoin does offer benefits, but the discounts that could be possible using bitcoin haven't materialized yet.
Your average customer doesn't give a shit about the historical trustworthiness of who they're dealing with. All they care about is price or convenience.
People mindlessly feed their details into all kinds of crappy sites and expect to have their hand held if it goes wrong. Some type of escrow might temper that but you're stuck with third parties again unless it can be somehow automated.