The photo in question is at https://commons.wikimedia.org/wiki/File:N938AT_Boeing_717_flight_deck.jpg
As you can see you have offered two different licences for the image.
Firstly, you have chosen the GFDL. To comply with the GFDL, reusers not only have to credit you as the author, but you also have to 1) print the entire copy of the full licence text (runs into a couple dozen pages) or 2) provide a link to the text. They have not done this.
Secondly, you have chosen Creative Commons Share-Alike Attribution (various versions). To comply with this licence, reusers are required to attribute you (in this case "J. Griffin") and to distribute under the same Share-Alike licence.
Because none of these simple requirements are fulfilled, the listing on eBay is a copyright violation, and you have every right to go after them for it; i.e. send them an invoice or take them to court.
Whilst some of what Colin states above is correct, in the sense that making your works available under a Creative Commons licence opens them up for re-use by anyone for any purpose, so long as they adhere to the licencing terms, Creative Commons your works can actually be a great way to get exposure for your work. In case you are a "commercial" photographer who charges for use of your works, CC
licencing can also work for you in the sense that opening works up for wider reuse when copyright violations occur you are able to act legally, or send invoices.
I am an editor/admin on Wikimedia Commons and I have been very active in getting photographers to make their photos available under a CC
licence (see https://commons.wikimedia.org/wiki/Category:Aviation_photographers_by_website
-- over 200 a.net photographers so far do so). In discussion the other day with one photographer whose photos we host on Commons, when I asked them whether they would like to upload directly to Commons as well, his response (which I post here with his permission) was:
"Let me know how to do it and I will. I get lots of positive feedback from my photos that are already there....I love sharing my photos on Wikipedia. Funny thing is I have sold more photos for commercial use on Wikipedia than I ever did on airliners.net."
Don't discount CC
licencing and Wikimedia Commons; embrace it as much as you can. The trick is making your works available in such a way that you can still derive income (if that is your goal in photography); if you don't know how to do this, contact me and I can help to advise you on the best ways to do this
I also run @commonsaviation on Twitter if you prefer to contact that way.
[Edited 2014-11-24 03:41:07]