Don't check bids, in advanced search on eBay select "Sold Listings", which will only show you items that actually sold (as opposed to "Completed Listings", which will include stuff like BIN's that never sold). There's no point in looking at auctions that haven't ended yet.
That motherboard looks like it's going for $20 to at most $50. I wouldn't expect to get much more than $20 for it. Graphics card has sold as low as in the $120's and as high as ~$180, and the processor seems to be around $70-$100. I didn't do any refinements to account for used vs. new prices though, so I'd expect yours to be on the lower end. You'd probably do a little better bundling the processor and mobo and selling the card separately.