“If the cost of breaking into a system is significantly higher than the benefits gained by attacking the system, and the cost of protecting the system is lower than the value of what is being protected, then we call a system secure.”
– Jian Zhong, senior software architect, ActioNet Inc.
Although posted once on the Starbean forum before, I felt that this quote is very apt to justify for how much security is desired. Perfection cannot be achieved; there is no unbreakable system. Spending too little on security can compromise the system, overspending waste resources, time and money, with no further benefits.