I think one of the most obvious and glaring reasons is also one of the simplest - my company uses Trello a fair bit, we have a lot of teams on it, tracking a lo

I think one of the most obvious and glaring reasons is also one of the simplest - my company uses Trello a fair bit, we have a lot of teams on it, tracking a lot of stuff. And we've never once paid a dime for it. Never even been asked to pay for it. Brought us plenty of value, would have paid, but we never hit a threshold where that was a thing. I don't even know where that threshold is or if there is one.