As the old joke goes, he'd be clawing at the lid of his casket.
Except he was cremated, IIRC, to thwart any more drugs being found in his system (other than the Vistaril), so he spoils my joke.
He's probably be like that Video Professor guy, who automatically signs you up for $300 worth of DVD classes if you are foolish enough to express interest in learning "How To eBay" or whatever. People have had a hell of a time getting their money back.
He'd probably try whatever flavour of the month happened to be in the "motivational speaker" department. If self-actualization speakers were raking in the dough, that'd be his bag. If selling prayer hankies to the credulous was a bigger goldmine, then he'd be selling those. The tax exempt status thing would probably be too juicy to resist.