I don't know that it's ever been put so explicitly, but I have seen startups and ex-startups give out very highly compensated positions (over $300k) to people who were spouses, proteges, and children of people on purchasing boards at other companies.

Usually the explicit quid pro quo isn't needed because self-interest is enough to keep the parties in step. In that example, once the kid is given the job, the guy on the purchasing board has an obvious desire to buy at as high a price as possible, since it's not his money.

These are the sorts of issues that would be considered conflicts of interest, and require the decision-makers to recuse themselves, anywhere but Silicon Valley.