Rent control means that renting at a low price this year means you're also renting it at a low price next year. Without rent control you could give a discount this year and then jack the rate back up to normal next year.
Also not all property management is about renting out. Sometimes it is just about parking wealth and extra rent is gravy. So if you are just parking, moving to the max rent possible can be a desirable effect. As you may price people out and you do not have to have someone to 'manage' that property as intensively (broke AC, leaky sink fix, etc). Which would be an annoyance on a passive property.
