They must also pay cops well enough to keep them from finding informal sources of income to supplement their inadequate pay.
As if that's exclusively an urban problem. I'm taking a tax prep course being taught by an IRS officer and as he does so, he lives up the course with examples from his work experience. The topic that night was about what counts as income. The IRS isn't the morals police, just the tax police, so they are required by law to keep private about the sources of income. So long as you reported the income and pay the tax on it, it doesn't matter if it was earned legally or not.
Anyway, back to my point. One of the stories he told involved an auditor who went out to audit what he thought was a construction company. It turned out it was a rural bordello. The madam had actually done a fairly good job of complying with the tax law. The depreciation on equipment in the playroom was allowed, she'd reported her income honestly, and issued 1099's to her subcontractors for the services they had done for the customers. However, the deduction as a business expense of the bribes given to the deputy sheriffs to stay away was denied, even tho she'd kept the otherwise necessary records to show to whom and when she paid them.
That is an amazing story.