You pay more fees when your bitcoins get spread across many different wallets caused by using change addresses.
If your wallet has 1 btc and its gotten spread across multiple wallets "for privacy" this happens when you spend btc. Change addresses.
So you have 1 btc but now its in multuple addresses, so if you spend it you end up paying higher feess than if it sat in 1 single address.
Not sure why people keep trying to argue about something so simple.
