If this was the case though, don't you see a really big issue? They're running test data through a financial production system? That wouldn't just be retarded,

If this was the case though, don't you see a really big issue? They're running test data through a financial production system? That wouldn't just be retarded, it would be illegal anywhere else. If you're *SX and creating fake money in a real system you're going to get into a lot of trouble.