With 140+ views on the topic here and the lack of replies says a little.
Here is my take on them and is my opinion only so take it for what you want...
A 1 of 500 is not really rare. Rare is an over used term anymore. Uncommon yes , but I'd not say rare. I have and have had Ruger's that were 1 of 25 or 1 of 50 editions that you can call rare.
My second thought on these is that Ruger screwed up when they put the target grey finish on them instead of just leaving them in a satin stainless. I for one really dislike that finish and I'm sure lots of others feel the same way. That hurts the desirability of that model. When these came out , a local shop had a couple of them that sat for 2 years on the rack. Not exactly a brisk seller. I'm a Ruger nut and passed on them even when the price was slashed trying to rid them of his shelf space.
It was a nice try by Ruger but it didn't quite fly. Putting an engraved floor plate on an otherwise basic rifle and calling it a limited edition for a premium price doesn't make it so. Now if they would have at least put it in a decent stock vs the plastic maybe that would have helped.
Sorry to burst anyone's bubble here but like I said that's only my take on things. If you really want to find a value for it , list it on GunBroker and see what it does. Then you will know but I really don't think you are sitting on a highly desireable "rare" model here.