A 1% annual fee doesn't sound like much, but when compounded, fees paid to advisors and managers can have a significant impact on an investor's ending portfolio value. For example, consider two investors who each invest $200,000 and earn 8%/year (before fees) for 30 years. The first investor uses an ETF that charges 0.04%/year in fees, while the second investor uses a mutual fund charging 1.25%/year. The first investor ends with roughly $2 million, while the second nets about $1.4 million. The difference is purely driven by fees -- this is a huge cost. (See article here, Wall Street Journal.)
Dolvin, Steven D., "Fees Matter" (2014). All Chapters. 101.