In some cases, they are different products. During times, when Airport cards were separate products, I got mine in the US. That was a mistake - I had to live with one channel less. Today, the Samsung Galaxy S-series phones are different in US and the rest of the world. There are many other examples.
In other cases, it is about squeezing every last dollar out of the buyers. Mostly those in UK and EU.
In this case, I just hope they want to squeeze every last dollar out of their buyers, like Hollywood does with movies.
Otherwise, regional/country-locked sales/warranties make little sense.