The first time I did a black box mission i said the same thing.. i won't do that again. However, since I got more used to things.. i actually do all of those salvage missions (black box, ancient artifact, rebel transmission, military plans, fine art) quite often. The random nature of USS's can make them a little unpredictable but usually I am able to whip them out really quickly .. the pay for the missions isn't bad... often I manage to do some bounty hunting on the side, and they don't take long.
Tip: If you pick up similar missions for different systems... like say you get one mission asking for an ancient artifact in one system and 2 ancient artifacts in another system.... you can go to either system and collect 3 ancient artifacts and then turn them all in. They don't actually have to come from the system that the mission says.