...after that, the incentive might be to get you to sell those shares and buy more. That's called churning," said Mercer Bullard, founder of Fund Democracy, a shareholders' advocacy group. "If they get paid quarterly by a mutual fund company...

...even though all the people responsible for the performance of the fund that you're advertising have left," said Mercer Bullard, founder of Fund Democracy, a shareholders' advocacy group. Indeed, many fund families, including Fidelity...