Yup, it is, at every level

One main reason I started my first computer consultancy was that I found out that although computer stores and Value Added Resellers advertised independent objective advice to customers, they accepted major software & hardware vendors giving bonuses "spiffs" directly to the salespeople, blatantly corrupting their 'objective advice' (vs supporting the overall organization's ability to sell and support the equipment). One of the first things that went in the employee manual, and of course had to can some salesguy who tried to collect a spiff under the radar (our actual practice was the spiff goes to the company or goes uncollected, and if collected, we generally added half to discretionary bonuses).

Pretty small step from that culture of working to directly corrupt "independent" advice to trying to collect it on the other end. I'd like to know how many startups actively offer this kind of deal to execs in order to get the bigger deal?