For big companies or companies having enough money this is true: CTOs won't bite. But for companies which need to save money this can become an argument.
On the other hand did you heard anything about a linux certification ? IBM and other big companies are using it. It took time to spread the word that there is a free OS which can compete with M$ Windows and it will also take time with JBoss.
A small company will maybe accept JBoss with certification because it is free and open. For big companies we don't want to try to sell to the CTOs but maybe when employees start to use it for their own projects then with the time it will spread, too.