DNA testing is still a relatively new process that is being worked on and developed all the time. At the moment, in the grand scheme of things, not many people have actually had their DNA taken. The more people that do the DNA test, the more fun we will be able to have with the results.
DNA testing is far more interesting that the results that we are given. I recommend reading 'The Family Tree Guide to DNA Testing and Genetic Genealogy', by Blaine T Bettinger. It is a fascinating read that will help everyone understand more about it all.
Keep in mind that there are people that have taken the test for a number of reasons including; jumping on the DNA testing bandwagon for the sake of it, because they received it as a Christmas present or just because they wanted their ethnicity in a graph. Not everyone is interested researching their family tree and this is quite obvious on the many videos on YouTube, unfortunately. A lot of people just want to find out their ethnicity estimates, which at the moment, are still quite new and which the scientists are doing a lot of work on.
This leads me on to agreeing fully with JAKnighton's comment. Definitely see it as an investment!
Encourage people to take the test (if they want to, of course!) and keep contacting those matches (even if you aren't getting replies). I see the development in DNA technology similar to that of any technology. Things will start of slow and suddenly there will be a boom of interest and quick development of the process which will improve the results and the knowledge we gain from it.
Anyway, just my take on things!
Chris