The problem is if you're doing fan-translations and you start accepting payment from unauthorized repro makers, then technically you're no longer doing "fan" work but helping to create bootlegs. Which could be "crossing the line" to some companies. I don't know if I'd try that with Nintendo these days.
(yes, I'm aware of repro sites that routinely create Nintendo-IP repros, but I was referring to the C&Ds of the last year. Especially Pokemon Prism, a ROM hack that would seem relatively harmless to them.)
As to 7800 Ballblazer, isn't that the game that also gets cannibalized for its sound chip?