This came up in a thread some time back. I suggested it was a money-making operation by the WT. Get free labor to build a commercial space that can be used as a KH for a while and after a few years, it can be more easily sold as a commercial strip mall property than a stand alone building. Build a new strip mall using free labor. Rinse and repeat.
However, there was another poster who said he had personal experience in commercial real estate and claimed it wasn't an effective money-making model because strip mall properties, according to him, have next to no value.
So, who knows?