Why ? it should be obvious, real estate is the most valuable asset for the WTS. it has made the WTS a billion dollar World Wide Corporation. People giving the organization property to build a Kingdom Hall on and the WTS in turn persuades the trusties to hand over the Tittle of the property is what the WTS has done , not only that but the WTS loaned out money to separate congregations to renovate certain KHs which the congregation had to pay back to the WTS, only increasing the value of the property.
Most JWs aren't aware of the billion dollar sell off of the Brooklyn New York properties or the dozen branches that were sold off around the world. The WTS lied to the flock once again in stating its short on money but they are intending to build a brand new HQ in England.
Lies and corruption fronted by humble smiles and deceit, pretty much sums up the operation of the WTS since its inception as a religious publishing house.