When it's your house

If you're the landlord, it is your house.

The difference is that you're not living in the house if you're a landlord. A smart landlord will still do high quality repairs on certain things: roof repairs, pipe leaks, electrical issues, etc. Not fixing those things quickly and fixing them well could result in long-term damage to the property. But, there's another class of problems that are annoying to the tenant but not a priority for the landlord. For example, a toilet that doesn't flush well. That's an annoyance, but probably won't damage the property in any way, so the landlord might not care much.