The details of the personal expenses that executives put on the company tab often are not known because loopholes in federal disclosure rules let publicly traded companies generally avoid disclosing the perks they give executives along with pay and stock options.
The lower spreads mean lower costs for investors, because Nasdaq investors generally do not trade directly with one another. Instead, they usually buy and sell from market-makers, brokerage firms that flip shares between buyers and sellers and keep the spread for themselves.