Hi David
I couldn't agree with you more, it's a sad fact that many of us who look forward with great anticipation to your next work don't often get the chance to meet and get a 'personalised' signed copy to add to our collections.
So I would rather not have a signed copy at all , especially one being sold in the 'Markets' you mention, perhaps if everyone did this ,it would then 'kill off' these 'sellers' and encourage authors such as yourself to attend more signings and get to know your true followers better !