I just bought it, for two main reasons. First, I just bought a shiny new DAC. Now I wasn't planning on changing my media player, but this DAC came with downloadable reference WAV files to test whether the signals I was sending were arriving intact (bit perfect). After spending an hour trying to pass even one of these tests in my old (free) media player, I downloaded the trial version of JRiver. It aced every single test, including the non-trivial 32-bit tests. That for me was the sign that someone was taking the audio seriously.
I also needed a streaming device to connect to my stereo, and didn't want to buy an expensive proprietary streaming device and be stuck with whatever someone else's idea of a decent interface looks like. Instead of spending hundreds of dollars I installed Linux on an old Mac Mini I bought for $20 and it's been running great as a headless server. I can control it from my main computer, through VNC with a remote desktop, or from my iPad, and can use the Linux platform to get as crazy as I want with custom controls and scripts. From this board the developers seem very involved and responsive to questions and comments, I've never seen anything close to that from free players. Took a little bit to get used to the layout but that's true of changing from any application, while superficially similar to my old program the functionality is much more powerful and tweakable. In a few months it's going to feel like that favorite recliner you can't get rid of, so I expect the real pain will be if I ever have to switch. The only way to prevent that is to support the work, and I'd prefer to own something rather than pay a subscription, pay hundreds of dollars into it and have nothing if I ever decide to stop.