If you were the only one in possession of oxygen I would buy it from you, but that would not imply that I had no problems with the idea of buying oxygen.

Also, the difference between GPL2 and GPL3 is large enough for many BSD backers to be of concern (the anti-Tivoisation clauses mean that one cannot close down firmware compiled with a GPL3'd version of gcc if it contains even the tiniest part of libc. Possibly, even using some of its macros in your code would be enough to require you to make your software GPL3. We won't know until this has been to court, but why take the risk?