the peices on the board represent divisions, corps, etc.
Each infantry model on the board probably has about 100 snipers in it. but it consists of maybe 10,000 - 50,000 men total, so the snipers dont have that much of an effect.
Snipers would be a good unit for a stalingrad A&A game, but now your getting into a different area of gaming….tactical gaming.
A&A, Risk, Diplomacy…are strategic games.
Flames of War, A&A Miniatures, Warhammer…are tactical games
Strategic games deal with commanding grand campaigns, where tactical games are more like chess, each piece has a different and unique task. Snipers fill a tactical roll. If bishops are your long range artillery, rooks, the armor, then the knight is a sniper…for example.