Live sandboxes versus admin screenshots

Leland Fiegel posed the question on WP Chat, “why don't we seem to see more live sandbox sites set up?”

I know I heard from someone that A/B tests didn't show higher sales from using a sandbox/demo plugin. Personally, I'm pretty much just as content with good admin screenshots as a true demo.

A handful of folks responded to the thread with their own experience. I am curious about which Post Status readers (many of whom have WordPress products) haveΒ tried live demos, and whether you have additional insight.