I'm not sure about this either.
For me the teachings should always be given freely. But Buddha statutes and stuff... well it's just statues and figurines. So, if someone wants to sell and buy them, be my guest. Books have to be printed. One could argue one pays for the material like paper, the use of the printing press, stuff like that. That seems acceptable to me too.
As far as I'm concerned giving the teachings, like dhamma talks, guiding meditators on a retreat, things like that, should be free of charge.