If you have wood floors (esp. oak) on the same floor as your washer and/or if you have a drywall ceiling below it and/or if you have furnishings or equipment or heirlooms directly below... Use a pan. Imagine how much money it would cost to replace a completely ruined wood floor if something went wrong with your washer. Any decent amount of water will completely ruin and buckle up a wood floor. Washing machines can fail. I have also had to replace a brand new wood floor b/c of a leaky toilet that leaked for a whole weekend, got under the new wood floor and buckled it up. If you are on a strict budget, then research options that may be cheaper than a custom copper pan.