This advertisement is pushing hard on the 'for the people' theme. Interesting read, than you for sharing it.
It's a bit misleading in that the World's Fair Directors did not have 5,000,000 souvenir half dollars in their treasury. The authorizing legislation allowed for up to 5,000,000 coins to be minted. By the time of this advertisement the Fair Directors had possession of 950,000 1892 dated coins.
Appears that the 66,000,000 Americans at the time were just not that interested in owning one of these fabulous souvenir coins.
I recall your prior reporting that nearly 2.5 million of the 4 million 1893 dated coins were returned to the mint destined for the melting pot.