I don't think we really want to travel down this road, because you're talking 10% of the population and then an even smaller portion that have Dish.
For instance, all of the gay people I know have cable... If the stats ring true, that means of that 10%, 0 have Dish. I'm sure someone could be gay, have Dish, and want those channels. But for whatever reason Dish has done the numbers and determined that there's not enough to justify it.
I do watch G4 sometimes as well as IFC (IFC shows Clerks, amongst other things). LMN was probably 'part of the deal' for carrying Lifetime, which my sister and mother watch.
Jewelry TV I think sells Jewelry right? Dish probably has an arrangement with them where they may get a little something for carrying it.
For those who DO want a particular channel, you should certainly made it known, band together, etc. Prove Dish's numbers wrong. If you can get a related group to help you out (for instance a GLB group), then maybe you can be loud enough for them to take notice.
I have nothing wrong with them adding any content, but at the same time it isn't my fight (I'm rather indifferent). On the other hand, I've fought for straight white guy channel for many years and people just call me names like 'intolerant'..