That's not true. The company I work for manages to sell free software [1]. All the stuff we sell is under LGPL, and it's not open core, it is fully free software.
It works under specific conditions and you need to come up with a business plan that makes it work, but it is possible. And it is one of the most ethical ways to fund free software so it would be too bad to discard this option too early.
For us, what works is enterprise oriented extensions for a platform we develop. Turns out companies will fork off hundreds of dollars and enjoy the support that comes with it instead of compiling all this thing by themselves. It's more convenient and employees understand that it funds the open source software they are using, and it's an easily justified expense. But should they want to enjoy any of the freedoms that come with free software, they can.
It works under specific conditions and you need to come up with a business plan that makes it work, but it is possible. And it is one of the most ethical ways to fund free software so it would be too bad to discard this option too early.
For us, what works is enterprise oriented extensions for a platform we develop. Turns out companies will fork off hundreds of dollars and enjoy the support that comes with it instead of compiling all this thing by themselves. It's more convenient and employees understand that it funds the open source software they are using, and it's an easily justified expense. But should they want to enjoy any of the freedoms that come with free software, they can.
[1] https://store.xwiki.com