Earlier quoted context omitted.
Anyone who has been a landlord can attest "providing no service" isn't true at all.
Subjective. When I used to rent, I never saw my landlord after signing the lease. I was renting a house and taking care of small maintenance issues myself. I'd say it was far less effort to rent to me, then it would have been to live there himself. Of course there are bad tenants, but I suspect, like most things, we focus on those negatives and ignore all the low maintenance tenants when thinking about it.
all are guarantees even with the lowest maintenance tenants.