Take it easy on BBM. BBM is a consequence, not a goal. Focus on your league, you will make money by winning your league and being promoted. BBM is just a plus. Only 1 team out of 1024 win each BBM tier. It's a very hard task to win this competition regardless of the tier. If you play lower BBM tiers this usually means you are playing in low division leagues which means you won't be able to make much money which means your roster won't be very competitive, so it's basically a zero sum game. Play whatever BBM tier your team is assigned, enjoy what you get and be happy.