The devil is in the particulars. The balance of WOW Classic TBC Gold the PvP servers is very off. 40% alliance, 60% Horde. In PvE it’s the reverse side 60% Horde, 66 40% alliance, 60% horde. Alliance, 34% Horde.
What is the conclusion? Players on the alliance side are more focused on PvE, and this can be seen in server selection + side distribution. The Horde side is more PvP-oriented. This causes a massive increase in queue times despite the sides being almost identical overall.
We can fairly assume it won’t work for one Transfers to buy WOW TBC Gold servers with large queues were not permitted. Even a slight change in racial makeup wasn’t enough to convince players. It is well known that arena alliance racials are superior if all other aspects are equal. Horde PvPs are eager to be Horde. It is entirely understandable.