I don't think that metaphor fits at all, because this isn't about people swearing off an entire class of services ("women are evil : web-based payment companies are evil").
To better fit your metaphor, I'd say it's like having all your guy friends warn you that they each had a relationship with Jenny and she cheated on every single one of them, and you shrug your shoulders and say, "Well, she hasn't cheated on me yet, and besides, I think that was totally understandable behavior."
>they each had a relationship with Jenny and she cheated on every single one of them, and you shrug your shoulders
To be crass for a moment: If he's only bothered if Jenny puts out that night and not about a long term relationship, knowing that there are other girls he can sleep around with, then he wouldn't be bothered.
Tunnelling through the metaphor: If using auto-sweep he's only risking, it seems, one or two days of payments. When/If he gets cut off by PayPal then he can jump ship.
To better fit your metaphor, I'd say it's like having all your guy friends warn you that they each had a relationship with Jenny and she cheated on every single one of them, and you shrug your shoulders and say, "Well, she hasn't cheated on me yet, and besides, I think that was totally understandable behavior."