I run a small consultancy (myself, though I engage peers whose work I respect as subcontractors for larger jobs), and the #1 issue I've faced are company representatives who look for consultants to make them, personally, rewarded: Their concern is primarily their own personal benefit, not the benefit to the company. Whether it's professional sports tickets, expensive dinners and lunches (which sound small in the small, but when you have a company representative who schedules regular "status meetings" during lunch/dinner, you know where it's going), and so on, it is an industry absolutely dominated by kickbacks, the whole notion of which feels dirty and fraudulent.