If an alcoholic BECAME a provider, it would, IMO, be difficult to stay sober. Actually, even social drinkers who are at risk of a problem would probably end up struggling a lot. Same with other addictions.
When they see a client, most providers only show their sexy selves. Clients can only guess at the gritty side, and we usually don't want to see it. Also, very few of us want to hear any sob stories and get hit up for bail, car payments, airline tickets, hospital stays, or whatever the latest tragedy that has befallen them.
At the same time, there's this chemistry-driven urge to get to know the lady better, the hope for an OTC cocktail, or the "real date" of taking her out without paying for her time. So I suspect that most providers are reluctant to disclose much about themselves, and that what we might learn is only the tip of a huge iceberg. Even though they might want to share a little something about who they are aside from the lady that sucks guys off for a living, there are probably a few lies woven in to whatever stories they tell.
To me it sounds like it would be a very lonely life to lead. Ironic only because they can relax and enjoy the sex when they like, and for male clients that SEEMS to be the antidote to all loneliness. But not being able to let many people know who they are sounds lonely in a way that could easily result in slipping into some bad situations.