Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why is the total 401(k) contribution limit (employee + employer) so high?
Because 401k's are also used by self employed. A person who has a schedule C profitable income can open a 401k and "match" in whatever ratio he wants, up to 25% of the net profits or the limits you stated. This allows self-employed to defer more income taxes to the future. Why only self-employed? Good question. Ask your congressman. My explanation would be that since they're self-employed they're in much more danger of not having income, especially later in life, if their business go south. Thus they need a bigger cushion than an average W2 employee who can just find another job.