[quote=@Kingfisher][b]Magic is a risky and unpredictable business, with most preferring to use physical means to get their dirty work done.[/b] However, a few occult groups exist within Santa Sombra, giving sacrifices to otherworldly beings in return for demonic powers, and the occasional down-on-their-luck gambler will pray to some obscure trickster god in an attempt to fix a poker game. The most common use of magic is in distilled manners, such as placing charms on weapons to increase their lethalness, or reinforcing bank vault doors with protective wards.[/quote]

I would assume the risky business part is the reason.