Because the Soviet Union had the cash to pay up front for everything it needed... and agriculturally it never wasted any produce, nor had any issue distributing food supplies around the country, and conscripting 500,000 men a month for the duration placed no further strain on the state whatsoever. It's not the dollar value, it's what was supplied. "One of the main areas of cooperation was aviation fuel. The USSR could not produce gasoline with high octane. However, it was this fuel that was used by the equipment supplied by the Allies. In addition, the Achilles heel of the Soviet Army was communication and transport. The Soviet industry simply could not meet the demand either in number or in quality." "The Allies supplied 1900 locomotives to the USSR, while only 446 locomotives were produced in the country..." "It was not only supplies of finished products, but also raw materials that were extremely important – metals, chemicals and products, which were either not produced in the USSR or lost to the enemy. For example, more than half of Soviet aircraft were produced using aluminum supplied by the Allies." Russian historian: Importance of Lend-Lease cannot be overestimated So, please, lets remove the copper, communication devices, 400,000 trucks, and halve the Soviet air force. To say nothing of all the food supplied... Good Luck USSR.