Mutual funds have a sneaky way to charge you with what they call an expense ratio. You never see a bill, they just take the money out of your account, like a boat with a leak in it. A 1% expense ratio will take 30% of your returns over 30 years (assuming a 6% annual return). You’d lose $142,154.88 over 30 years if you initially invested $100k. With a low-cost fund at 0.1%, you’d only lose $16,034.83 over 30 years.
More info: Don’t let high costs eat away your returns