Inexpensive - Paper is most common raw material. Paper computer - System organizes processing of information in much the same way as a computer, only much more slowly. Easy to maintain - Procedures are largely self documenting because they are made obvious to the player. Otherwise, the model would be unplayable. An average size game will take 2-4 hours to play to a decision.
Larger ones take much longer.
Not highly iterative - Time required for each game takes too long. Replaying individual turns has value, and proceeds much more quickly. Numerous iterations are required of a game in order for its results to have statistical significance. Precursor of Computerized version . Programmer needs a manual model to work from.