Rashi quotes the Medrash which states that a plague of leprosy on the house was a blessing in disguise. Upon hearing about the eventual entry of Bnei Yisrael into their land, the Cananites hid their valuables in the walls of their houses. Thus, they sought to prevent their valuables from falling into Jewish hands. In order that these treasures would be discovered by His people, Hashem caused a leprous plague to appear on the house. The houses would then have to be demolished, thereby exposing the hidden treasures. This seems a rather indirect way of giving riches to people. Why…
