If its a good friend why couldn't you just "borrow" them for as long as you need them??? I borrowed a friends kayak for several years when I had to be on the east coast for an extended period of time. I gave it back when I moved back and bought my own.
My rack is slowly becoming just a pile of aluminum. I'm amazed at how little everyone thinks WC Friends are worth. I guess things would be different if Chouinard had his stamp on it. Old Chouinard biners seem to have gold inlay these days. Always under the impression that the nutted axle Friends were superior to the peened rivet looking end of later editions.
If you had original friends, marked with just a "1", "2", or "3", circlips holding the cams to the shaft, then, maybe they'd be of interest to a collector. Still, they don't command a huge amount of money. Maybe 30 bucks per or so.
If they say Wild Country on them, they'd be worth, like said above, maybe 10 bucks per. People sell them here at swaps for around 5 a piece.
The older Wild Country models will say "patent pending" on them. Newer ones will list the patent number.