I would really like to know how much he spent on getting a passing reference in the least popular ST show of all time.

From what I have heard, that part of the line was not even scripted. The actor ad libbed it in hopes that it might lead to him being gifted a free Tesla vehicle.

EDIT: There was also the completely unrelated reference in a later episode, in which a character mentioned having gone to Musk Junior High School. That may have been a paid reference.