Casascius has the same software in C#, to calculate everything, with 5 minutes of work you could have it loop to find any given key. Why would someone not pay $20 to have his code modified and accomplish the same, impossible feat?
To save more of 100 hours of work. Not easy as you say, not only a loop.
The program execute oclvanity and process the results at runtime automaticaly, and is integrated with Abe database.