I personally think the other way. The problem isn't that no one wants to play Alliance. In fact, many people openly say they would prefer to play that, but give up because of the overwhelming Horde population, making it so too many people playing Horde to be the real problem. You deal with that by limiting how many people can play on that side, like we did by closing character creation, and with faction-based queues, as is being likely already being tested for technical feasibility. Giving Alliance bribes is just creating a new problem that won't solve in any way the current one, which isn't racials or whatever, but being constantly ganked by huge numbers - if you think I'm wrong, count how many people complain "Alliance isn't worth it, I keep losing to Horde in a fair balanced fight" and how many say "Alliance isn't worth it, I keep getting ganked by 5-10-20 Hordes."