In France, most president were career politicians as well, AFAIK only three of them actually worked in the private sector at some point (Pompidou, Giscard d'Estaing and Macron, all of which were banker prior, in he same investment bank).

So not a lot of diversity, but even if that's regrettable, it's pretty ridiculous to blame Mélenchon for that.

I looked that up before posting, out of curiosity.

Seems Biden only became a millionaire after his stint as VP, from book sales and speaking engagements. Being in Congress doesn't pay much.