Sir Edward Peacock, a former governor of the Bank of England and Controller-General of the Duchy of Cornwall, was requested by Edward VIII about a year before the abdication, to invest his private fortune of over £1 million, deriving largely from the duchy revenues prior to his accession, into non-English securities and a settlement for Wallis Simpson. Sir Edward advised that if knowledge of this transaction got out, it would prove extremely unpopular, but Edward insisted upon it. At the time of the abdication, he pleaded poverty to the Duke of York and estimated his disposable income to be no more than £90,000, or effectively an annual income of around £5,000 - according to Philip Ziegler, a "suicidal" lie, suicidal because it would be demonstrated to be a lie when the new king assumed responsibility for the duchy finances. This was the basis on which the new king provided an income for the Windsors, as it was decided that he could not seek to do so from the civil list because of the complications inherent in the Duke of Windsor's life interest in Sandringham and Balmoral, which the King was partly buying out in his annual payments to the couple. And it was this lie which caused the King to threaten to revoke the income he was giving the Duke. "You were under great strain and I am not seeking to reproach you or anyone" he wrote in February 1937. "But the fact remains that I was completely mislead."
A charitable interpretation could be that the security of money became much more important to Edward as King and Duke of Windsor as his life leading up to and after the abdication became both devoid of the purpose for which his life had been dedicated (albeit not by him), while the security of the loyalty given to the crown by his family and the country devolved upon his brother. Hence his constant demands and fears of poverty, possibly sincerely meant but frankly ludicrous given his personal fortune which was well able to cope with a very luxurious standard of living for a childless couple with no taxes (at least outside the UK).