[superstraightsg]

Best Case Scenario Estimate:
Let's assume that the ML makes $50 per hour, regardless of the entrance fee
For a shop that operates from 0830 to 2230, that means 14x 1 hour slots max per day
Which is $700 per day, and $21k per month, if the ML forgoes lunch and dinner, and is able to max all her slots every single day.

My conservative estimate:
The ML is only able to fill 1/3 of her slots per day, on average
Her split at around 3:7, so she only makes about $30 per hour for a ~$90 entrance fee
That means she only makes about $2.7k per month
Not a lot left after you deduct rental and daily expenses, and that is assuming she takes a cut from the basic service

Doesn't take much to see why the extras are a lot more appealing since you instantly double (or even more so) your earnings