I agree, although so far I haven't heard of any problems with the RFB. Keltec built and tested it with possible military sales in mind (You and I both know that would never happen, but you can't blame George for dreamin' big). I might go $1800 for it, but $3K is insane.
It does mostly depend on what you want it for. I bought an SU16 mostly because of the rumblings that I might not be able to get one later and I liked the features (folding stock, piston operated action). It's not a gun I really need, so normally it would have been farther down the acquisition list but circumstances change.
So if you've already got your purposes filled, and with the PLR it sounds like you do, then get whatever is the coolest to you.
I haven't see the Ruger, so I'm going to vote for the RFB partially because its next on my "I don't really need it, just think it's neat" list.