I don’t know that he didn’t, or didn’t offer to do so (the article doesn’t say), but it seems like the obvious thing to do for a guy with a passion and a couple billion dollars in the bank. Indeed, a sponsorship arrangement with NASA would have been a coup for both. Trade Cameron the rights to market the resulting imagery in exchange for underwriting the camera, let him produce a theatrical 3D documentary using it, and both win: Cameron cleans up at the box office, and NASA gets a great PR and education/information outreach opportunity.