Blackrock - TBC

When Qing for Battlegrounds on Outland, it's hard to get AV, and BGs in general to pop. It's near impossible to get anything but WSG to pop during NA times.

Why does Icecrown/Lordaeron get Blackrock w/ CRZ when they are crowded enough on their own when Outland is the only server that would actually benefit from it?

Free advertising for Warmane - Outland because people get to experience the great PvP it offers.

Right now, Blackrock players are suffering because they are up against Icecrown players. The difference between s7 and s8 is very big.
The difference between s2 and s4 are very marginal in TBC, it's much harder to gear up on Outland compared to Wrath, and it's not loaded with s4 players.

s7 and s8 are both available on Outland. They only don't start with full bis and only have one more tier to go.

Wotlk gets Blackrock cause there's demand for it. There were two TBC realms before, and then population dropped, so they shut one down. Opening up a new one would only spark curiosity and people would quit soon afterwards.