There are people in Westcrown - people people, not just the wizards and new money - who'll sell their souls to devils on the promise that they won't be broken in Hell.
Most of them are broken in Hell! I've watched, by scry, because I'm not stupid.
Random Wescrani petty nobility don't have anything they can offer that's worth anything to Hell, and you can't get something for nothing, but random Wescrani petty nobility aren't competent to realize that and walk away from the phistophilus and so they just keep trying. And when you turn down counteroffers from someone who doesn't want anything you want to sell at the price you want to sell it, and you keep doing this until you get a deal that you can't see any problem with, you're not just asking to be taken for a ride you are literally demanding it. Wescrani nobles walk off happy with some contract that looks like it'll take the work of an inglorious life to repay but is actually impossible, and they think that they're safe, when there was never any chance of that, not for someone like them who has nothing to sell. It's different for someone important, like Abrogail Thrune.
I'm smarter than you at least are acting, because I know what I'm worth, and I know when a deal looks too good to be true.