TorqueSim owns the aircraft. RealSimGear owns the Perspective+ Software Suite produced by @Coop for them. The hardware does model the proper avionics for Perspective+.
For a grand total of $2,839 you get:
A software suite to upgrade your RealSimGear hardware avionics to Perspective+
A licensed copy of the TQSIM G6 engine and flight dynamics upgrade
Combining the two gets you a complete G6 package, as you're looking for. The reason this is not sold for retail is because the 3D model and displayed avionics in sim does not change, therefore, RealSimGear hardware is required to make it look and feel like a G6. The Perspective+ software suite from RealSimGear does not render virtually in the sim, only on their hardware screens.
You've got it right. Many of these SR20/SR22 owners are just purchasing the above package to have at home. There are no plans to bring it to retail in the future. We catered to the demand that was asked of us, which included the hardware. The people who typically buy these planes (the real ones, not sim ones) don't worry about the simulator setup cost. Doesn't apply to all of them, but does seem to apply to a lot of them.
See this video as well: