If you consider the possibility of limited development time there may be a flaw in this argument. If GUI loving newbies are only willing to pay for GUI version of the application, it may not make sense to develop both.

On the other hand, it is probably easier to build a framework of test code around a CLUI than to record and replay sequences of keystrokes and mouse clicks. The unwanted CLUI might be justified to assure quality.

--mandog