In the Trial of St. Joanne d'Arc one of the two Johns testifies regarding any desire he felt towards Joanne ~ which was quite a relevant question since the custom of the times was that any woman alone was fair game for any man afoot.
Gilles was a man of his time until he went crazy.
You must not have noted the list of palaces he owned and needed to sell to support his bad habits ~ in their day they were all located where you'd imagine only the highest of high borns would have them ~ particularly those along the Loire.
De Rais' proclivities were not normal - not really conducive to Henry VIII levels of illegitimate fecundity.
Moreover, almost every noble house in Europe can trace their ancestry to at least the eleventh century, some to the eighth.
There are no historical records tracing any of these houses to de Rais, who died in 1440. Name one European noble descended from de Rais - it should be easily checkable.
De Rais was wealthy because he was awarded lands on account of his military accomplishments, being named Marshal of France. He was not the highest of high borns, and was actually disinherited. His remaining wealth and lands were seized by the King, his brother and his cousins.