I think the current GB are not so smart at all. They are like spoiled heirs squandering away the fortune their (grand)parents Russell, Rutherford and Knorr amassed by being smart.
Yet even these guys....Look it may be smart to make money of off gullible people. But being só gullible that you even believe your own fairy tales...that's an incredible level of stupid.
As drug dealers say: Never use your own product ;-)
Edit: I think all smart stuff in JW land (like the different money grabs) were not dreamt up by the GB, but by the lawyers. Possibly not even JW but worldy sharks.