My first PBE acc got wiped... that's even worse. I had it since season 2 and randomly got removed, no reason was given by Rito support when I asked for it.
Also, if you have ever received a warning, chat/ranked restrictions, or a temp. ban you will never be allowed in PBE.
They only accept players with a completely clean history, so that is pretty much the reason for 90% of the player base to not have a PBE account.
Not sure if region matters, as there is only 1 PBE server located in the U.S. - living outside from it is at least 100+ ping.
Buying a PBE acc for $15 is the easiest way, but ain't gonna waste my money on that