Your other two points are laughable. First, you employ the whole 'Buyer Beware' mantra, except not all scams come with such dead giveaways. What happens, for example, when an up-til-now reputable seller takes a ton of order money and bails(a pump-and-dump scam)? Second, you go right back to that faulty reputation argument, even going as far as to say that it's the seller who's more trustworthy than the buyer. Why is that? I've never seen anything to back that up.
All of your points put so much control in the hands of businesses. It's almost like you want to absolve them by default if the consumer gets screwed over. Where do they go for help? Bitcourt?
As a fun aside, there actually was a 'bitcourt' of sorts. It was a pretty screwed up system, and only survived up until the point where the judges ruled against the creator of the 'court.' Then he shuttered the entire thing.