Q. The fact that a non kosher product is sold mostly to non-Jews does that permit marketing it?

A. The prohibition to commercialize with non kosher products applies even when you sell the items only to Gentiles. This is obvious, since selling to Jews would be anyway prohibited as placing a stumbling bock before the blind (lifnei iver) or helping others to do something prohibited (mesayea).
Remah (117: 1) prohibits buying non-kosher food for one’s Gentile workers. Many Poskim permit, as they don’t consider this to be a business. (Shach ibid. 3, Taz ibid. 2. See Pischei Teshuva ibid. 4) 

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a