I really don't understand your reasoning for wanting an About Us page before purchasing a service. I don't feel that this level of paranoia is appropriate when using online services.
Don't get hung up on that about page too much. An imprint is usually fine, an about page is even better.
The reason is very simple: From my experience, legitimate businesses have an imprint. As I said, an imprint is mandatory in most countries for commercial websites and trying to hide the address is very sketchy.
