Hi Brutusmaximus:
The best explanation was given by (Expabrit).
The H M Riley Trust is a U.S. trust that has the Watchtower Society as the sole beneficiary. Basically, it is a vehicle to make income for the Watchtower, using assets left by Henrietta Riley. The income generated by the trust is transferred to the Watchtower by means of a "donation". For the year ended April 30, 2002, the trust generated income of $1,740,127 and donated $1,945,645 to the Watchtower. In comparison, for the 2001 year the trust generated $2,939,731 in income, and donated $3,285,050 to the Watchtower. The difference between income and expenditure is made up by realising gains on the assets held.
In-other-words, every time someone purchased a pack of cigarettes, it helped H M Riley or Phillip Morris, and in turn donations went from Phillip Morris right into the Watchtower's pocket as a beneficiary! The trust built up interest as time went by, and the Watchtower took the proceeds from this interest. At least thats trhe way I understand it.
Thanks!