Generally the value proposition of these kind of services is that you can try to reproduce an issue that only shows up on a particular piece of hardware and OS.

Generally the value proposition of these kind of services is that you can try to reproduce an issue that only shows up on a particular piece of hardware and OS. For instance, someone with iOS 7 on an iPhone 5, which you can't even buy new right now. Or a particular Samsung phone that wasn't very popular and was only sold for a few months.