"Delisting in and of itself has had no bearing on a company's true value for purposes of tax reporting in a full write-off situation."
The thousands of zombie stocks festering without value in the more reckless speculators' portfolios tend to contradict that argument.
Lazarus-like OTC penny stocks that re-emerge with a concrete value from de-listing after having been on the Grey Sheets are pretty rare.
Perhaps you know of some counter-examples to prove me wrong, however?
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it."
Upton Sinclair
"Nobody ever went broke underestimating the intelligence of the American public."
H. L. Mencken