I'd actually say the opposite about 12 back Palitoys. There has never been higher demand for them however there has never been so many available. As yet another case of DSC appear on the market this will only serve to deflate this over inflated market further.
I sold my Stormtrooper, R2 and 3PO some months back. The purchaser decided to get them graded and they did well: 2 x 80s and a 75 (one small fault to card). I had sold them at a bargain, direct sale price (what I paid for them, as it happens). Once graded, he relisted on auction on eBay. They sold for what he paid plus grading fees. Knock off the eBay and PayPal fees and he would have lost a fair few quid.
This 3PO is around 350. 400 with a following wind and some nuts bidding on eBay. Then, of course, you have fees. On here I'd say 320-350.