In MG's case, I think it's pretty simple. If they could get better licenses, they would translate those instead of the horrid nukige. Without writing a wall of text about it, it's all about the licensing cost vs actual sales. If you take huge games from companies like Key, the music licenses alone would cost like hell, among other things (Kara no Shoujo voice license cost). On the other hand, a lot of VN companies are really xenophobic when it comes to licensing VNs in the west so they don't even want to talk to MG about it.
JAST - they most take already translated scripts and buy them from