Why should they ?
I have no doubt they are doing a lot of great work. But the same goes for the Haiku team for example... And you don't need to pay for it. You can donate, but don't have to.
Making people pay for it is their choice, I accept it. But they don't need to charge for it to continue: money pays for site hosting, computers/devices support, pizzas (
),... but that's it.
I don't understand why on the Amiga everything needs to be paid for.
I also do not understand why the vast majority of people in the Amiga world think everything should be freaking free either.
If I had put the sort of work in required to write a PPC OS, i would very much like to have some token cash.