Grey markets aren't the same black markets. Ideally the government would be omniscient, efficient, and benevolent so that it could properly regulate things to the benefit of the masses, but in practice it government isn't very responsive and in many cases has to consider different viewpoints on an issue. Even worse, regulations usually create winners and losers in a way where even if it's beneficial to change the regulation, whoever would lose out will automatically be opposed to the change. Americans - mostly working and middle class, not wealthy - bought 50+ billions of dollars of goods imported this way last year. The American people have voted with their wallets but the government is not responsive to their desires in this case.