Whatever the flaws in the Australian 2003 Clinical Guidelines, and they sure have them, they did end with this emphatic statement on the whole notion of 'secondary gain':
In the absence of evidence of malingering, speculative judgements about unconscious motivation should be avoided. The psychoanalytic concept of “secondary gain” has been misused in medicolegal settings and does not rest on a solid empirical base. In evaluating patients with CFS, hypothesised secondary gains should be weighed against manifest secondary losses. The notion of “abnormal illness behaviour” is contentious, and the term should not be used as a diagnostic label.
https://www.mja.com.au/system/files/issues/cfs2_2.pdf
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