I have had several readers over the last year reach out to ask about this. I ended up adjusting the pricing in Amazon per region (print copies) and creating discount codes for people to use on my site based on the honor system[1]. For books I sell through Pragmatic Programmers, they did not have a way to adjust the pricing per region.
For me, the goal is reach and not profitability. The reality of selling technical books is that you can’t make a living on it, so it's really a "loss leader" on my employability.
In the past six months:
• 390 total orders
• 116 used one of my PPP discount codes
• Mexico's code is the most used, followed by India, then Europe. Mexico and India offer the steepest discount, though Europe's is not particularly steep, so I don't think anyone is gaming the system. Note that the amount of discount is not published until you apply the code at checkout.
For pricing an app or other thing where economics were more important, I might still do it, and factor it into the business model, basically eating some AOV to get growth/TAM.