Without getting caught and being able to use this information? Are you sure about that? Why aren't there more people doing it then?
When one learns of the dark web ways, @PeroK is correct. Some hackers steal the information and then put it up for sale on the dark web. Other folks buy it and begin the process of actual theft. This makes it near impossible to track down the original hacking group.
Also this is how the pwn websites work to help you determine if your password/identifying info was stolen and should be changed.