Testing tubes for audiophiles requires much more than simply running them briefly on a tube tester. If it was that simple and people would pay $10 per tube for that it might be a viable business opportunity for existing dealers. Most testers can check for basic functionality of the tubes, but testing and rating them for microphonics, noise levels, and precise matching is much more involved and can require a significant amount of additional gear. That's why the companies that offer such extensive testing are able to and justified in charging a relatively high premium for their most select graded tubes. If you want the best tubes expect to pay for the time and effort that is required to grade, match and select them.