Sam I am
What did I tell you...
It is a matter of supply and demand. Supply you've got, demand is dependent on who you're trading with. If your trader is a hardcore fan he will be more willing to trade at a higher value, a casual player won't be so inclined. As the HeroScape promos have no value except what the market will bear. As for the T&T Nerak sale for $120, check back in a month and it will still be there. That sales technique is basically fishing for idiots, leave it there until someone with more money than sense comes along ...
Basically, there is no hard fast answer to your inquiry.
As for sets or singles? Selling sets is better if you need cash right now, selling singles are better for getting more cash value out of the product.
I apreciate the reply. Would a trade vaue around $45 be reasonable? Seem as best I can tell that is about what they go for. OTHER that T&T where they'd be $500,000.