In my opinion its not a good system for consumers to buy sample libraries on faith or video demos alone, especially when you cannot return the product if it doesn't meet your needs/expectations. I also find it interesting how every FX plugin I know (including VSL Vienna Suite & MIR) allow for fully usable demos for as long as 30 days, while actual sample library playable demos are very hard to find. Even though they both use the same copy protection! Why is this?
If I remember correctly, VSL use to offer a sort of "demo hard drive" where you could try all their sample libraries for 30 days if you purchased the drive. Maybe something similar can be done, but via download, where you can pay X amount to demo a library, and if you like the library the cost of the demo will be applied to your purchase, but if you decide not to buy VSL keeps the fee to help pay for the servers, etc?