Musclepharm dont get any revenue at all from Jackson or anybody they sponser.... believe me I wish they did :P
They pay them in cash and/or shares depending on the deal in exchange the athlete is supposed to actively talk about and promote Musclepharm products. thats all.
The Lambo was an outright gift from the company to Jackson. Which would be fine if MSLP was a big profitable company with cash in the bank to spare on such antics. But when they are a huge loss making company and constantly diluting shares its just a kick in the teeth to shareholders.