Average oil company profits are also ~8.3%, not 10%.
The Truth About Oil and Gasoline: An API Primer
http://www.energytomorrow.org/energy_issues/truth_about_oil_gasoline_primer.pdf
2007 Earnings by Industry, Page 14.
Of course I’ve got to recommend you stop vandalizing private property. I think that type of action is best left to the enemies.
It’s not vandalizing any more than the people putting ads on your door or windshield offering jobs or carpet cleaning services. The glue is quite weak.