BTL is often considered Passive investing, but it can never be completely passive. Property Management improve the passiveness of the investment but even then some input is required and there is a lot of your money often staked in the property so it is important to be part of the process.

There is a chart of explaining how it is beneficial to use property management which also helps explain how there may be times when it feels like it is wasted money and why averaging out what management means helps make it seem more worthwhile.