I haven't increased my tenant's rent since he moved in 14 years ago. What he pays me covers my property tax and utilities. I'm not greedy.
I bet your were pretty particular about whom you rented it out to as well.
My wife rented out a 1500sqft townhouse we own for $600 a month plus utilities. (That's a lower than most apartment rentals in our area). We pay $250 HOA a month, so she pockets $350 a month (which pays for any repairs and taxes). The profit is barely worth mentioning, but the tenant takes good care of our property. That was the main reason we rented to them. We turned down hundreds of potential renters.