and in a truly free-enterprise (deregulated) system, they would.
But the GOP has fortunately worked furiously to enact bills that shield companies from the liabilities of their spills, forcing taxpayers to pay for them instead. Hence, those offshore drilling cos., and all related businesses (including those that service the rigs) are only in business because the federal government has regulated the system in their favor.
Which means, your business only exists because of (the aforementioned) federal regulation forcing taxpayers to pick up the costs from spills, i. e. because the government has enacted laws that interfere with the market to tilt the playing field in your favor. So thank the feds for your livelihood, and stop bitching.