It’s a free software DAW and thus a valuable program that has the potential to attract a lot of semi-professional and professional audio users to GNU/Linux (given the pricing, missing portability and inferior support for customization of the commercial alternatives).

Until now its main developer Paul Davis was living off a corporate sponsorship. This has changed:

With the end of SAE sponsorship, subscriptions & donations are the only thing that make it possible for full-time development of Ardour to continue. In January this added up to US$1968. That’s less than 1 copy of Nuendo, 4 copies of Logic or 40 personal copies of Reaper. If you agree that it takes more than this to support to keep Ardour moving forward, please subscribe or donate. Your support is critical and much appreciated.

Paul has not only been the industrious main developer of a great piece of free software but also a valuable member of the GNU/Linux audio user and developer community.

Although I’m not an Ardour user right now I have subscribed for a monthly donation nevertheless.

I strongly suggest you support him, too.