Confused on the expenses

[Brian Parker]

Newbie here to BP community but feeling addicted to it and the tons of YouTube videos. Educating myself as much as possible before taking the first step. 

One question I have after watching several deal of the day videos when they are using the rental calculators to evaluate the deal and cash flow and such....why are fixed landlord expenses being shown as power/water/sewer/trash being shown?? 

I just recently moved to AZ and I am currently renting a house and I as the tenant pay all those expenses.....so why would a real estate investor calculate those expenses when the tenant should pay those?

Am I missing something? I completely understand setting side money every month for the repairs/cap ex repairs/vacancy. 

This might be a simple answer and if anyone could explain it that would be great. 

Thanks 

Brian