The rear shock on my RG lost its rebound damping late last year so I sent it to Shock Treatment in Penrith (Sydney) for servicing. They rang to say the rod needed rechroming and the shock piston was had it and as its an odd size (44mm), they didn't have a spare to replace it with, so it would need an aftermarket solution - Gold Valve, which they would give to me at cost. The cost all up, with servicing, new oil and gas: $467 ($120 for rod rechroming). Its a lot, but I don't see it as an unfair price for what was involved (and they had very good customer liaison skills, which helps).
Then they rang me to say they'd found an old 44mm piston which they could throw in for nicks instead of going the Gold Valve route. But by then, I'd read enough about how well your shock works with a gold valve in, I said, blow the expense, let's go gold.
Now I just got to work out how to tell the missus....and 'negotiate' on what penance I got to pay for this latest indulgence at family's expense....