[boogies]

SA is copyleft (https://en.wikipedia.org/wiki/Copyleft, http://www.gnu.org/copyleft/, http://www.gnu.org/philosophy/pragmatic.html).

That just means everyone you share your stuff with must share alike (what SA stands for) anything they choose to publicly publish that they’ve made out of your copylefted work (their derivative works), in the same way you shared it with them (as https://creativecommons.org/licenses/by-nc-sa/3.0/ says: “ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original” — in this case CC-BY-SA).

That doesn’t mean they can’t sell it, it just means they can’t claim it as their own and refuse to let any one else make their own derivative works of it under the same terms they made theirs.

(Edits: Formatting and quote)