The beginning of EVOLUTION 2012 started out with a bang, with the announcement that Persona 4: Arena for the PS3 will be region-locked.
Since the article I linked to is just too wordy, I’ll copy and paste the important bits.
[...] we are not doing this out of malice or a desire to control.
The decision to region-lock P4 Arena was a business one, [...]
[...] the dramatic difference between the Yen and the Dollar makes
for a dramatic difference in price.
Indeed, the reason for region-locking was not out of malice or a desire to control. It was simply an innocent act wrought from harmless greed. God bless capitalism!