The almighty dollar.With the mark up he gets (alot of times for doing one quarter of what the customer has paid for )all he needs is a few new Viper owners (read about his cars in major mags )to score a nice hit for the year.I've heard enough about Hennessey's reputation that I'd only buy one of his products second hand - already built, complete and delivered. That said, there is collector interest in his Vettes. Personally, I think the Hennessey Vipers look terrible with that awful Jay Leno cariacture fascia.
A prominent designer pointed out John Hennessey to me at a VOIX dinner. If he's so hated, why in the world would he come to VOI?