Well klutch told me what Happend, If we could find a API as fast or like the live stock exchange, maybe it would work.
~ @denden1088
The problem is you really won't, especially because server lag also has to be taken in account. Even in "real time trading" there are still computers that are able to trade faster than humans because they receive data quicker that make pennies but are able to make trades like this all day. The development time spent to make this system even close to functional with minimal exploits (I say minimal because people will still find a way) would outweigh other projects that would most likely be more beneficial.
For that reason -1, but I really would like a stock exchange because I like trading... But for the above reasons I still don't think it can be done effectively.