This is actually a pretty common occurrence, way more common than you'd think. There are far fewer RP realms than there are PvP or PvE. Originally, there were only three realm types: PvP, where players were automatically flagged when they stepped out of the starting zones and into the "real world"; PvE, where players were never flagged unless they wanted to be; and RP, where players were encouraged to roleplay. These RP realms were actually PvE realms; players never found themselves flagged unless they wanted to be. When patch 1.8 was released, Blizzard launched RP-PvP realms, where PvP players that wanted to roleplay were free to do so.
There were a small handful of RP realms at first, and more were introduced over time. The first RP realms had very heavy populations as a result of tons of players that wanted to roleplay; the introduction of new RP realms helped ease the overburdened realm population. This continues to this day -- when a new RP realm is announced, you'll see the new realm population explode with roleplayers looking for someplace a little less crowded.
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