The Steipler Gaon once entered a shop to purchase a lulav, but finding none to his satisfaction, he indicated to his attendant that they should leave. As they approached the door, the Steipler suddenly turned back, selected a lulav, paid for it, and left the shop.
His attendant asked: "Rebbe, you were leaving because you found no suitable lulav. Why did you turn back to buy one?" The Gaon replied: "You must understand that there were many customers in the shop. If they saw me leave empty-handed, they would conclude that the store lacks quality lulavim, causing the merchant financial loss on my account. Therefore, I returned and purchased one, so people would say, 'This shop has good lulavim, for the Steipler bought his here!'"