I'm not trying to start a flame war, because I understand not everyone here is a friend of Rick. From what little I know, the fact there is but one dealer for Prof in the US was primarily caused by lack of interest from the other dealers. The market for PC tuners here is much less than in several other parts of the world, and the unit costs are small. If you look across the FTA dealers in the US, very few even carry a single PC tuner. They are not the hottest tickets and these are not the best of economic times.
I don't know why Prof shut down their online store, but there are a number of good business reasons one might suspect. In reality there are very few technical goods made in the Far East that we can purchase directly from the manufacturer. One of the exceptions disappeared; big deal.
For those who feel the need to not support Rick, the DVB World tuners are available at other dealers at demonstrably higher prices. I'm sure they are quality units, but I see no value in paying an additional 50% or more. Nevertheless those with different political/personal principles may find them far more attractive. Having personally imported both DVB World and Prof tuners in the past from China, I can say the markup on the DVB World tuners is much higher.