Well irrelevant is a strong thing to say! Kidd was giving the figure of 100k £ not me!
Dismissing our estimates as guesses is not helpful. As most of the treasure is gold the estimates are quite realistic (with margin of error) because the gold price then now are known facts and as such the calculation is right. Please provide your own estimates if you know better.
The relative (political) value in the 17th century is important because it can help with understanding the overall story of Kidd's expedition. I can understand if you dismiss history as irrelevant in the age of satellite imagery and metal detectors but others here don't share this opinion.