Bitstamp is the only exchange not trading Litecoin, I get your frustration about "the what Litecoin adds"... usually it is a business decision and not what I think or what do you think but what the market is voting for. in other words market needs.

Ok, let me be clear, I remember once when we were changing servers (my previous job) and our infrastructure for the last 15 years was all bought from Dell, now as I was the latest addition to the team I was open to pretty much anything, but the older Admins didn't want to go HP because they didn't see why HP instead ? Dell hardware works same, even better because they Had years of experience amd they were used to it,  for some reason the Regional business team decided HP.....

Long story short, some members of the team didn't like it but they got use to it and I think the company did benefit out of this big time.... I can tell you many examples but I am sure you do understand what I am trying to say here