I'm not sure if even the Mafia makes the sort of profit you seem to think is normal.
here are some 2007 data:
Network and Other Communications Equipment 28.8
2 Mining, Crude-Oil Production 23.8
3 Pharmaceuticals 15.8
4 Medical Products and Equipment 15.2
5 Oil and Gas Equipment, Services 13.7
6 Commercial Banks 12.6
7 Railroads 12.4
8 Entertainment 12.4
9 Insurance: Life, Health (stock) 10.6
10 Household and Personal Products 10.2
11 Securities 10.1
12 Insurance: Property and Casualty (stock) 9.9
13 Real Estate 9.9
14 Scientific, Photographic, and Control Equipment 9.8
15 Financial Data Services 8.7
16 Food Services 7.9
17 Publishing, Printing 7.9
18 Utilities: Gas and Electric 7.9
19 Industrial and Farm Equipment 7.6
20 Electronics, Electrical Equipment 7.6
21 Hotels, Casinos, Resorts 7.3
22 Aerospace and Defense 7.2
23 Beverages 7.2
24 Chemicals 7.0
25 Internet Services and Retailing 7.0
26 Food Consumer Products 6.5
27 Telecommunications 6.4
28 Health Care: Insurance and Managed Care 6.2
29 Petroleum Refining 6.2
30 Computers, Office Equipment 6.0
31 Metals 5.5
32 Packaging, Containers 5.5
33 Home Equipment, Furnishings 5.3
34 Wholesalers: Diversified 4.3
35 Specialty Retailers 3.8
36 Information Technology Services 3.8
37 Energy 3.7
38 Airlines 3.6
39 General Merchandisers 3.5
40 Health Care: Medical Facilities 3.3
41 Pipelines 3.1
42 Engineering, Construction 2.8
43 Health Care: Pharmacy and Other Services 2.6
44 Food and Drug Stores 2.1
45 Wholesalers: Electronics and Office Equipment 1.6
46 Automotive Retailing, Services 1.1
47 Wholesalers: Health Care 1.1
48 Motor Vehicles and Parts 1.1
49 Food Production 1.0
50 Semiconductors and Other Electronic Components 0.6
51 Diversified Financials -0.9
52 Homebuilders -9.5
Who should decide who makes too much? How many laws would it take to re-order that list in the way that the gov wants?