Didn't you know how worthy is the medium of "Unique Gelatin Silver Print" ? Have you ever even thought how hard it is to manipulate Unique Gelatin Silver Print ?
Ok, joking aside, gotta admit that a 2m x 4m pinhole photo is quite an interesting feat. But 78k$ for that one in particular? Hmm...
I guess you could always make another " Unique Gelatin Silver Print" should another person show up with another $78,000. What was really impressive about Ms. Lutter's and Shi Guorui's work was the precision and perfection of such large paper negatives.
They were impeccable. They had me trying to figure out how they accomplished it the whole way home.