Hiring an employee costs the business a lot more than what they the salary (think benefits, insurance, office space etc....). Where I work, the cost per day of

Hiring an employee costs the business a lot more than what they the salary (think benefits, insurance, office space etc....). Where I work, the cost per day of a 'resource' is at least 4x their salary. Plus, if they're full-time you can't just use them when you need to, when you have cash etc - you're committing to paying them for a long time.