It is unwise to pay too much, but it is even worse to pay too little. If you pay too much, you lose some money, that is all. If you pay too little, however, you will sometimes lose everything, as the thing you bought cannot do the intended job. The law of economy forbids to obtain something of high value for little money. If you accept the lowest bid, you must add something for the risk taken by you. And if you do so, you have enough money to pay for something of higher value."

John Ruskin (1819-1900)