Not with the sale price of the app at least. Just like there is a review process for the app, there is also a separate review process for in-app purchases. 1 tier across all countries for each in-app purchase and the initial sale price.
Now, with that being said, I have not seen an instance of a developer or seller abusing the localization API for this purpose... meaning forcibly charging other stores for the same in-app purchase content. A separate in-app purchase would have to be made in any case for other stores to route to. Apple has a pretty firm fist and I imagine location abuse like this may lead to the seller's account being banned or punished. It may be perfectly allowed however, I haven't dug too deep into the TOS.
