Sure, if you're writing barely working software to start, but then you'll probably have to put in more effort to maintain a fork for whatever support period you do offer.
Though for the purposes of extending the useful life of a product, throwing it over the wall would be a huge improvement. Publish your garbage code and whatever documentation you have, and people can pick it up themselves, which you already find people doing today but with the added barrier of having to reverse engineer it.
