I assumed they had a day job while doing this on the side. One that pays for normal expenses including rent/mortgage, health and dental insurance, etc. They need to make enough money to cover all that on their own. Not to mention that they had the luxury of using that day job as an explanation when asked about what they do for a living.
Making the money is not a problem I’m sure especially if they’re hot and can keep regular clients. But if they only get one-time clients then they need to get ready. Some months will be busy and others not so much. A good review helps boost the business while a bad one can ruin it. They don’t have the luxury of that steady income from the day job once they go full time escorting. Having an ad online could also expose them. They may have a friend or a relative that uses the site.