Alot of my projects are things I've thought of (unless otherwise noted) and over the years I've gotten a bit pissed off with people building my stuff, selling it on without even bothering to credit me in anyway. I don't care if people build/sell this stuff but one of the unwritten rules of open source stuff is that you always credit the original person.
I've seen many of my projects floating around being sold by various people with no mention or link to where it came from and it put me off sharing stuff so I simply stopped bothering putting effort into posting here. But seeing this on eBay was the straw that broke the camels back.
people within "open source" give you stuff they've spent time and money developing - the very least you can do is respect them enough to link to the original post and/or credit them ESPECIALLY if you're making money out of them.