My colleagues think it is stupid of me to write for free. They think it is easy to sell copies, even when it is not. I am tired of hearing their same old arguments. It is almost like money has taken over their lives entirely. It came to a point when I don't want to even talk to them. What argument can I use next time, which, by judging them, would be in five minutes, they begin to tell me to quit writing? I can't ignore them, we need to be a team. But they are getting on my nerves.
Ya know, judging by your story, your colleagues are toxic. If you have the opportunity to drop them, drop them.
Anyway, about writing for free. People have different takes about this issue. As for me, though I've been offered contracts for my pet project, I declined all of them because some contracts will make a slave out of me, or the publisher would demand I write in something I don't like. So, in the end, I realized I can just write and publish for free.
Yes, I'm 12 books into my pet story. And I do it (money and large number of readers be damned) because I enjoy it.
And yes, I understand. Some authors need money to survive, but it's their situation, not someone else's.
As for you, enjoy what you do. Yeah, money is powerful and necessary, but it's not everything (trust me, when you got the bucks, the next thing you'll look for is 'real' happiness, which can only be given by contentment).
Best way to answer them: Smile. Agree. And do whatever the fuck you want to do anyway.