Unless you want to give it to a good home to someone here, aka be a contributor to one of our projects, why wouldn't you throw it on eBay?
$5k is way too steep for what it does, IMO, especially given the inroads made by DIYers in repurposing things like Damien's efforts with the Prius inverter. I think the Rinehart's days have passed.
If you're looking to place it into a project here, why aren't you simply ratcheting your ask down until you get someone who's interested?