My experience is the lower you go the worst customers you get.
At first I wanted all the accounts I could get my hands on so I had a massive amount of non paying customers.
Type of grass also will determine the amount.
If I see bahia grass I don't bid.
Chances of a bahia customer caring about his lawn is very slim.
Some guys here in my area are doing $35 lawns for 15 bucks.
20 bucks and includes the hedge trimming etc.
I check for pest like ants etc.
I check for irrigation systems.
tell tell signs if a customer is worth giving a discount or even worth having as a customer.