Because they won't put in the effort to just pull up and post the customer lists of companies selling LISP commercially. ;) http://www.lispworks.com/success-st

Because they won't put in the effort to just pull up and post the customer lists of companies selling LISP commercially. ;) http://www.lispworks.com/success-stories/index.html http://www.lispworks.com/success-stories/index.html https://franz.com/success/ https://franz.com/success/ The companies that use LISP don't talk about it much. I'm not saying secret weapon or anything either. I'm saying they seem to be among the set that just identifies something good for the business, buys/builds it, and solves business problems. They don't write articles about their programming language. What I will say is the small number of case studies on those two companies have much more interesting software than what's advertised for many stacks. The kinds of things people use it for corroborates the LISP advocates' claim it's a favorite for hardest, constantly-changing problems. It's more remarkable with Allegro since they charge royalties on top of the licensing with customers still buying their stuff.