Thing is, a player will only need one team. That's twelve models for each BB player. Compared to the cost of creating like 8 new BB teams and the number of people who will actually bother buying new miniatures when they already have a team/people willing to get into the game(not that many!), it probably wouldn't be worth it. Still though, it might be because of their current economic pickle. GW have often released seemingly unprofitable models before, so hopefully when the company gets back on its feet specialist games will get more attention.