Whenever a renter leaves, you have to put time and money into preparing the unit for the next tenants. During that time, you are also missing out on the rental income that you rely on. With turnover being as costly as it is, landlords should do what they can to keep the existing tenants they already have, especially if they’re reliable.
It’s far more desirable to hold on to renters that have things like apartment insurance and pay their rent on time than to potentially have difficult tenants. Even spending a little money on your tenant retention efforts could potentially save you more in the long-run.