eec0eb03_s__Pro___Con_in_the_Gun_Debate__Anti_Gun_Viewpoint
[Pro Gun Viewpoint] The low price .50's start around $1200 up to $6000 or more. They are also very heavy and awkward (starting around 16 lbs and about 3 feet long), making them unsuitable for criminals. But they are suitable for bench-rest shooting competitions where they are most frequently used. [Anti Gun Viewpoint] 
The 50 caliber rifles are excessively powerful "sniper" rifles unsuitable for hunting or sport shooting.
Taking On Gun Control - Viewpoints: Pro & Con in the Gun Debate
Anti Gun Viewpoint