Why you would not consider cycle training?

"I don't need training I know how to ride a bike"
Says bloke

This is a common reaction from people, (mainly men) when it is
suggested that they get some cycle training. It has always been a
struggle to explain to people how they would benefit (and I suspect
were it not for wishing to become an instructor many cycle trainers would have
said the same thing)

This response may be explained by the Dunning Kruger effect (
http://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect )

"a cognitive bias wherein unskilled individuals suffer from illusory
superiority, mistakenly assessing their ability to be much higher than
is accurate. This bias is attributed to a metacognitive inability of
the unskilled to recognize their ineptitude"

Which links to the 4 (actually 5) stages of competence:
(http://en.wikipedia.org/wiki/Four_stages_of_competence)

1. Unconscious incompetence
   The individual does not understand or know how to do
   something and does not necessarily recognize the deficit. They may
   deny the usefulness of the skill. The individual must recognize their
   own incompetence, and the value of the new skill, before moving on to
   the next stage.[2] The length of time an individual spends in this
   stage depends on the strength of the stimulus to learn.[3]

2. Conscious incompetence
   Though the individual does not understand or know how to do
   something, he or she does recognize the deficit, as well as the value
   of a new skill in addressing the deficit. The making of mistakes can
   be integral to the learning process at this stage.[4]

3. Conscious competence
   The individual understands or knows how to do something.
   However, demonstrating the skill or knowledge requires concentration.
   It may be broken down into steps, and there is heavy conscious
   involvement in executing the new skill.[3]

4. Unconscious competence
   The individual has had so much practice with a skill that it
   has become "second nature" and can be performed easily. As a result,
   the skill can be performed while executing another task. The
   individual may be able to teach it to others, depending upon how and
   when it was learned.

5. (Enlightened competence -Teacher)
   The person has not only mastered the physical skill to a highly
   efficient and accurate level which does not anymore require of him
   conscious, deliberate and careful execution of the skill but instead
   done instinctively and reflexively, requiring minimum efforts with
   maximum quality output, and is able to understand the very dynamics
   and explanation of his own physical skills. In other words, he
   comprehends fully and accurately the what, when, how and why of his
   own skill and possibly those of others on the same skill he has. In
   addition to this, he is able to transcend and reflect on the physical
   skill itself and be able to improve on how it is acquired and learned
   at even greater efficiency with lower energy investment. Having fully
   understood all necessary steps and components of the skill to be
   learned and the manner how they are dynamically integrated to produce
   the desired level of overall competence, he is thereby able to teach
   the skill to others in a manner that is effective and expedient."

So have you considered cycle training?
If not, why not?