gvlocksmith:
So, why haven't I heard about any tools designed to extract pins from inside of the lock? We have key extractor sets, but not pin extractor sets?
Good question, and if you can come up with a method, patent it.

*seriously*
Here are some of the problems involved with that idea that must be overcome. (in no particular order of importance)
1. keyway warding. As you most likely work with a wide variety of locks, you can probably understand the complexity in coming up with a tool that can effectively FIT into some of the keyways available.
2. keyway warding. As you are most likely aware, keyway warding also prevents the pins from tilting. In order to pull them out either the warding would have to be removed, or the pins "made" so small as to bypass this warding.
3. size of tool necessary. The tool would have to be extremely small, extremely tough, and extremely sharp.
There are probably other issues, but those are the three big ones, and yes, I know I mentioned warding twice.

For a reason.