I have repeatedly considered selling OEM parts on ebay, I get decent discount sometimes, especially if I buy bulk. I am disheartened when I see something which is clearly worth a lot of money at the parts counter go for pennies on ebay.
If anyone plans this, remember to keep careful tabs on what you bought, what you paid for it, what the fools paid for it, what your ebay fees and postage etc cost and record the whole lot in a spreadsheet. This is for when Revenue and Customs pay you a visit...