mwack - 3:41 pm on Nov 9, 2005 (gmt 0) It's all a matter of what they're worth to YOU, not of what they're worth to a potential buyer.
It seems like your articles are worth alot to you. You say there are none like them and that these bigger websites can garner a lot of traffic/conversions from them. Instead of pricing them as you normally would an article, price them as they're worth to you: is it worth it to sell them for $100 a pop? Can you make more by keeping them and developing your website? Would you sell them for a huge price - say, $600 per article - because you feel you can make good money with them?
It's all a matter of what they're worth to YOU, not of what they're worth to a potential buyer.