Your missing the FAQ:
3.3 - Does OpenBSD provide an ISO image for download?
Some other open source operating systems are commonly distributed as CD-ROM ISO images. This is not how OpenBSD is distributed.
The OpenBSD project does not make the ISO images used to master the official CDs available for download. The reason is simply that we would like you to buy the CD sets, helping fund ongoing OpenBSD development. The official OpenBSD CD-ROM layout is copyright Theo de Raadt. Theo does not permit people to redistribute images of the official OpenBSD CDs. As an incentive for people to buy the CD set, some extras are included in the package as well (artwork, stickers etc).
Note that only the CD layout is copyrighted, OpenBSD itself is free. Nothing precludes someone else from downloading OpenBSD and making their own CD. If for some reason you want to download a CD image, try searching the mailing list archives for possible sources. Of course, any OpenBSD ISO images available on the Internet either violate Theo de Raadt's copyright or are not official images. The source of an unofficial image may or may not be trustworthy; it is up to you to determine this for yourself.
The only difference I see is that Theo doesn't allow downloads of the ISO images.
Here the ISO's can be downloaded, but they still are not permitted to be redistributed in any way if the layout is copywritten.
So someone could get all the same utilities as on the official ISO image and arrange them in any fashion but the way this ISO is layed out.
Now when you see them on EBAY you tell ebay they are infringing your copyright and they should take them down.
Make sure to copyright every page of this site so they can't copy/paste it into the ebay auction, or even a portion of it.
You could even go so far as to trademark the name "Ultimate Boot CD" and UBCD or whatever, then if they used it in their ad, you could inform ebay they were violating your tm as well. Admittedly TM law is much more complicated than copyright law, so this one I even less clear on, but enforcement might qualify as informing ebay.
Thats my take on it at least, just an idea. Can't hurt to try it if you have a bunch of free time on your hands :)