While NO company wants consumers importing at lower prices due to differences in currency values of other countries - Perhaps Sony saw the error of their ways in past generations when they realized that people taking steps to mod for imports in almost every case opens the door to play pirated games, as the PSP and PS3 are both region free devices for current gen software. (Though not for movies.)
Just speculation, but maybe it was an experiment that worked out for them (at least in the case of the PS3) in preventing piracy.