Whenever real or personal property sold on execution is purchased by the plaintiff or any other lien creditor entitled to receive all or part of the proceeds of the sale, the sheriff upon proof of that fact shall accept on account of the purchase price the receipt of the purchaser up to the amount of the proceeds to which the purchaser is entitled. The sheriff may require payment in cash of all legal costs distributable from the proceeds of the sale.
231 Pa. Code r. 3133