What you fail to realize is you've had many offers from some of the most reputable collectors on this site. By continuing to bump your "give me higher offers", you've in essence caused a lot of people to not even want to deal with you, as it's quite obvious you're not able to:
a) place an accurate value on your items
b) get that magical "damn the cost, I need them!!" response
c) both?
I think you either need to post a price and sell them or accept an offer that's been previously given... Just my opinion...