0 actually. The OS is unsupported, the Office edition probably as well, the parts themselves haven't been made in a decade, and when compared to a 'much faster, newer UNDER WARRANTY' laptop is only $249 at Walmart, there is no real market except in some rare part you would have to know how to take apart the laptop to sell.
Honestly PCs are like Cell Phones now, and as 'disposable' every couple of years because of the price push.
Think of it this way, they sell Windows 8 Tablets for only $149, and can do all your laptop can do but fit in your hand and is touch screen, so why would I buy your laptop? See what I mean a customer (buyer) would think?