The point is, people come into BM expecting to play as a team with their realm as the "teamplay" on the front page would indicate. Their expectations may be very wrong depending on the level of intra-realm conflict, and then they are turned away as their expectations were not met.
Either we cultivate more realm-team spirit, or acknowledge to new players before they join that there is a lot of politics and whatnot that sometimes create teams apart from the realm-team.