The annoying and somewhat disconcerting thing is that sooner or later every account seems to 'fall'. Obviously I've had similar experiences to everything people wrote here but the most current example for me was Brielle Day. I'd been subbed to her before, now and then and she was active, responded, felt like a real person, wasn't trying to sell you stuff all day long.
Then a while ago she suddenly re-subs to my profile (like they all do with former subs to send more spam) and suddenly she just sends messages and PPVs all day long, seems to be online the whole day and of course I ask if she's got a manager for her page now which she quickly denies claiming she'd never trust another person with all the stuff she has on here (sure) and that it's simply her most active platform and she did a poll where her fans wanted her to be more active (lol). So she went from just a normal account when I was subbed to her, to one that sent new offers and chat baits all day long and when I asked one time how she's still awake (early morning), she just said she can't sleep. Of course, every day.
The absolute funniest part was though, since I just kept replying nonsense to her chat bait, is when she replied:
"AUTO REPLY: Your subscription has expired. Subscribe again to resume messaging privileges."
Mind you, I hadn't been subscribed the entire time since she started this and I just kept replying to her (while not subscribed), so someone actually typed this out pretending to be an automated system. After that they finally unsubbed to spare me the spam.
I'd have to agree with what some others said, it's only really worthwhile with small accounts now, specifically those that do not spam you every single day. With all these chicks trying to become 'Top 0.1%' they've completely ruined the platform making it little more than a marketing scam.