I'd like to respectfully protest the concept that ghost peppers add spice with "no flavor". Ghost peppers have some of the most complex flavors of any chili I have ever tried (and I make my own hot sauces).
I have used fresh and dried ghost peppers, there are hints of chocolate and sweetness and a completely different taste than any mexican peppers.
As far as being too spicy, its simply a matter of how you implement the pepper into a chili sauce. Dave's, for example, likely uses few other ingredients to bring out the flavors or dilute the spice. I make a "garden ghost sauce" using the dried peppers, roasted red bells, garlic, peppadews,etc. One of the most flavorful, and yeah, still hot, sauce.
I just don't like when something gets right beyond someones personal spice level and they claim it's "empty spice without flavor"