Currently, there are probably dozens of people who have paid for these maps. Instead of individual people each buying the same maps from the USGS over and over, someone bought the whole set, and wants to make the money back so that he can hand them over to the Internet Archive for redistribution.
If you’ve got cash to throw at something, throw it at this. Easily achievable goal to help bring more map data to the masses. USGS Topo Quads are one of the great things that the US government has put together: getting these publicly accessible would be a great thing for everyone.