One consideration for the providers to consider:
Like Von Spieler mentioned early in this thread, occasionally (often) I'm in the mood for some pampering and then a release. I typically get that through a visit with a L+ provider, or an AMP. Lay back and enjoy. Not dissimilar in principle to a BNG.
But some of those sessions start as one thing, and because of various reasons - most often the skill and demeanor of the provider - evolve into something else. A rub and tug becomes a rub and fuck. (Doesn't it sometimes feel like you'll just die if you don't "get some of that'?)
In retail they run ads and specials to get you in the door. Then they focus on opening your wallet, and if you show promise, making you a repeat customer. Seems there might be some hobby parallels, for at least some of the ladies.