There are so many variations in VSL of articulations based on actual musical practice that are very important in performance, and it is difficult to make people see that before they actually use the library.
Indeed, and I think it's wrong not to talk about these features. There are a lot of demos, but no information.
As a new potential customer you have absolutely no clue of what you get: What is a performance repetition? What is a performance trill? It's in the Full Library! Ah, okay, do I need it then? But it's so expensive... I'll buy from another company, because others say that VSL is “old” and “dry” and the legatos of the competition are much better.
I experienced the same and bought a lot of other libraries. They are good at some points, I like their slow legatos, but VSL is still great. New customers don't (and can't) see this point, because of the missing information and because there isn't a lot of talking about their libraries.
Of course, that's only MY opinion.