Joe, I want to offer my support for what it's worth. there is no way to set prices on super rare stuff. there are those who would love for it to be listed auction style in the hopes that it would not perform well and they could get it cheap. I've seen it happen, sometimes the right people just don't see it, and sometimes there aren't enough bidders, sometimes the timing is bad, this is a bike that the right guy may need a bit of time to make a run at. none of these factors make this a good auction gamble. I remember a certain Huffman Super Streamline that caused a stir a few years back at Copake. the bike was offered around for $700.00 for quite a time and sold at auction for $4000.00. the current owner wouldn't let it go for that now though, and I'll just bet it's the same people grumbling on your Gull that were outraged that they didn't get the Streamline for $700! some people seem to think everything should be theirs, and are willing to be quite rude and devious to get their way.
I think your bike is amazing and appropriately priced. don't cave in, find it the right home.
P.S., bring it out to the Coaster ride next weekend, we'll find somewhere safe to store it during the ride. it would be great to see it in person, and get some photos of it!