I've had a few occasions to ponder this over the years.
Let's say you're an average guy. Your ability to charm the ladies was sufficient to maybe get a drunk girl in the sack a time or two in college, and then persuade a decent woman of lesser intelligence to marry you (if she married you, she has to be of lesser intelligence, right? ). You have certain needs -- whatever they may be -- that are unfulfilled, so you turn to the hobby.
You meet a nice young lady. (Or two. Or three. Or a half-dozen. But we'll keep it simple and singular.) She fulfills those needs, and you wouldn't mind at all if those hour-or-two-at-a-time meetings could occur more frequently. You like her, but not enough to declare your undying affection for her, offer to "take her away from this" (even if she might be receptive to such an offer), or even become her sugardaddy (even if that were financially possible). In fact, you might not want to spend more than an hour or two at a time with her. But you do enjoy the time you spend with her, even when you're not fucking.
[slight hyperbole]
Isn't it somewhat strange that the best thing you can do for her is tell all your "friends" what a great cocksucker she is, how she'll suck your balls dry as the Gobi desert, and they need to hurry over and fuck her NOW?
[/slight hyberbole]
I wonder if that's one reason that some guys don't write reviews, though by their positive comments in other threads, you know they've seen someone and enjoyed her companionship. Not sayin' that's the only reason, but I'll bet it's a consideration every now and then.