I look at it this way - my favorite series was ST DS9. This series, in my opinion, was the peak of the ST series. The first two series, TOS and TNG, set the stage for DS9. The last two series, Voyager and Enterprise, were forgettable failures.
I want to see DS9 in HD. How will this come about? With the success of TNG. So, I will buy the seasons sets, and, by doing so, I am investing in an effort to bring DS9 to HD.