Open source only makes sense if you are either paid to do it or all of your users are able and willing to submit high quality patches. I've seen this phrased as

Open source only makes sense if you are either paid to do it or all of your users are able and willing to submit high quality patches. I've seen this phrased as open source is good for platforms and infrastructure, but bad for products. Open source as a product inevitably seems to lead to unhappy maintainers.