I believe there are very few if any careers in which someone can eventually get to the point that they truly "know it all". I would even go as far as to say that the most successful professionals are usually those who have a deep passion for what they do which leads them to push the limits. They are always searching deeper, reaching higher and striving to go farther than they have already gone.
The expense of learning can be high at times but we do what we must to pursue our goals. Only don't let it be just a delayed gratification. One of the most valuable lessons I've learned yet, is to enjoy learning.
Antoine
