War Mode exists because World PvP was dying. People felt trapped on PvP servers, and didn’t want to factionchange, but were either sick of the one sided nature (each server was dominated by one faction), or sick of not being able to play with friends and such.
The bribe is another in a LONG line of attempts to inject more players into word PvP (or PvP in general).
They all fail, because to the vast majority of players, PvP isn’t fun. So people don’t play. They’re bribed, they get their bribe, and they leave. Horde showed up without one. Except the free 10% because they were in no danger. But they didn’t like PvP. They liked crushing individuals with big group advantages.
Most players don’t like PvP. They just like to win.