Earlier quoted context omitted.
> selling expensive items like gold bars or cash online So as a consumer I finally have the opportunity to buy an expensive item over the Internet, get swindled by an unscrupulous seller sending me an empty box (if anything), and have absolutely no recourse? Is that the value proposition here?
Yes, you have an additional opportunity. You don't have to use it if you're not comfortable with the seller or the chance of being swindled. However, reputation systems seem to work alright, as evidenced by silk road where you really had no recourse but orders did come through. You could also use an escrow service.
I'm sure there's been a lot of analysis done with regards to the actual amount of fraud on Silk Road (and it's various incarnations and similar services), right?
There's no way that criminals with even lower oversight behave better.
The idea that you could have an environment where you lack the fraud protections you have in other environments leads to lower fraud rates is absurd, and would require a lot of evidence to demonstrate. An appeal to reputation systems doesn't cut it.