Why is it so uncommon to tip your landlord

We all tip for good service. If a delivery person delivers your pizza piping hot, or a barista gives you your coffee very fast you pay them a tip.

Why do people not give a % tip to their landlord?

Lets be honest here, we incrue fees for taking their money, and we have to free up time to check if they actually paid on time (because we all know most tenants are lazy when it comes to paying bills).

Is it wrong of me to call tenants and ask for a tipping % when I think I did a good job that month?