Disadvantages of Leasing Equipment. Higher overall cost. Leasing an item is almost always more expensive than purchasing it. For example, a 3-year lease on a computer worth $4,000, at a standard rate of $40/month per $1,000, will cost you a total of $5,760.igher overall cost. Leasing an item is almost always more expensive than purchasing it. For example, a 3-year lease on a computer worth $4,000, at a standard rate of $40/month per $1,000, will cost you a total of $5,760.