We profit from corporate involvment, when their contributions are released under GPL-like licenses. One of the most sane desktop environments ever was polished by Sun, for example. When corporations with hardware licenses work on the Kernel, they can use their knowledge to improve drivers. When steam needs windows games to run via Wine, they use their manpower to improve the translation layer. Etc. etc.
We are their parasites, but this is nothing to be ashamed of. Redirecting, or rather taming, corporate logic into work for the commons is the least we can do.