Some more odds and ends on buying and selling.
If the comic you list for sale doesn't sell, you really don't need to ask everyone why it didn't sell. Either the price was too high, or there isn't a specific buyer for that book currently checking out the For Sale thread. Or both.
That's the reason it didn't sell, not because you forgot your deoderant. Generally speaking, if your book or ones like it are consistant sellers on other venues, then your price is too high for the grade it looks (notice its not the grade you give it). Otherwise the books you have are not in demand (ie they suck)
If a buyer wants a discount it really should be done once and in increments of 5% or at least $5 or greater for comics less than $100. Or ask for free postage or free extra comics but asking for $10 off a $300 book is just plain annoying.