There are three reasons that "good landlords" seem to be scarce:

• People tend to be more vocal about bad experiences than good, so we'll definitely hear more about the bad ones

• Many people decided to become a landlord because it outpaced other "investments" greatly, especially if you're a shitty landlord who doesn't put profit back into maintaining said "investment"

• Many of the good landlords that did exist and weren't gouging eventually got hit with a bad tenant that cost them a lot of suffering and $$$ while being extremely difficult to evict. Whether it's true or not, I still hear current ones who say they're charging [crazy amount] to pad for the eventual $20k bill when a bad tenant wrecks their place (and these days it's not hard to do $20k+ in damage)

Also per the comic: I've never heard of anyone tipping a landlord, good or bad