Taking two examples of applications written in Lisp and trying to shoehorn a premise to it is ridiculous. Lisp/PHP/Perl/Ruby/Java are all tools. Anyone who tells you that one house is better than another because it was built with a different type of hammer would (and should) be laughed at.
Take this quote and substitute Ruby/Rails or Python/Django or even Java/Spring would give you the same answer and even have a larger base of developers to draw from.
"Our hypothesis was that if we wrote our software in Lisp, we'd be able to get features done faster than our competitors, and also to do things in our software that they couldn't do. And because Lisp was so high-level, we wouldn't need a big development team, so our costs would be lower. If this were so, we could offer a better product for less money, and still make a profit. We would end up getting all the users, and our competitors would get none, and eventually go out of business."