Pricing conundrum

Before I went to Riva del Garda for this year's AMLaP, I picked up a travel guide on my Kindle. (If only such things had existed the years I backpacked in Eurasia. My strongest memories are of how much my backpack weighed. Too many books.)

Oddly, the Lonely Planet Italian Lakes Region guide is the exact same price as the whole Italy guide. These local guides tend to be glorified excerpts of the country book, and since they both weigh the same...