I don't follow your post. The INS is a monopoly and is therefore expensive? IF that's Marine's point, it's pretty far from my question.
I beg to differ. IF it's Marine's point, it's ineptly made and a rhetorical "own goal", but it answers your question squarely. Why does the INS charge so much for paperwork? Because it can; it is a monopoly, and you have no recourse.
(Just to dispel all ambiguity, I don't really think it was Marine's point-- your question drew attention to the extortive methods of the INS in order to undercut Marine's jingoistic position; my intent was to point out that Marine's random-looking riposte can be interpreted as having taken off a couple of the defender's own toes.)