Hi Mike.
CD/DVD-ROM drives rarely have that much gold on them, but as others have suggested, putting the labor into extracting the circuit board is worth the effort at current prices. I did find one CD-ROM with a board that had a huge gold ground plane, so I took that off for extraction, but otherwise I just throw my drives into a gaylord and sell them for around $.10/lbs. I might start extracting the boards in the future as labor is becoming cheaper by the week.
Some older floppy disk drives (both 3.5" and 5.25", and all 8") have cast aluminum frames, but cleaning them up takes a bit of time and effort, so cheap labor is in order. I now sort all my aluminum framed floppies from the steel ones and hold out for a higher price from my buyers. If they won't pay, I'll do the labor myself for the aluminum.
Older hard drives (MFM types, from the 1980s) usually have a gold edge connector. I have a huge pile I have to go through to remove the PCB and snap off the gold edge.
Some older floppy drives (usually the 5.25" variety) sometimes have a small amount of gold plating on their control boards, and the older ones also have the gold-plated edge connector.
As always, the rewards are justified by the amount of labor required to extract the rewards. The more you value your labor, the more your labor will return to you!