Most of the billing companies have systems in place to prevent anyone from using hacked or stolen passwords, so in "general", (note the word general here) the password sites you run across nowdays are usually run by some kid that thinks he's Mr. Cool-ass Computer Boy, and are filled with LEAKED FAKE passwords straight from the site owners in an effort to bring traffic to the site.
As was said.... marketing. Hell, Globill even SUGGESTS doing this.
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OFF WITH THEIR HEADS!
*ERASERCASH!!!* $35 BUCKS PER SIGNUP!
*CASH IN ON YOUR TRAFFIC!* GammaCash