Fool on the Hill
No other reason? Donations were regged for it that, like all other donations to CofS, are not publicly accounted for.
One could also speculate that large construction projects can be used as a source of kickbacks, as is written about by Hubbard in the Mission Earth series.
Of course I don't know that DM laundered money that went to him personally in that way, but just setting up a project to "preserve the tech" hardly constitutes "proof" of DM's belief in the worth of Hubbard's "tech".
Oh you only say that cuz it's true.