@ flysurver: BD’s Diamond Club (DC) is an excellent FFP for those who are travelling on a lot of different airlines on paid Biz tickets. If not comped/status matched the first hurdle (16K status miles) is onerous as the counter goes back to zero. At the moment someone holds gold status and able to fly 50K BIS miles on paid Biz tickets he collects 100K status miles (excluding SQ less, BD more) within his 12 months observation period and will earn 170K award miles (= 100K + 25K executive bonus + 45K bonus miles). 170K award miles factors 3.4 for 50K BIS miles on paid Biz.

IMO this is the most valuable feature of DC: Cost of miles are between 0.675p and 0.7p (around 1 €cent/mile) when redeeming an award. Look how much time and money some customers spend for unnecessary trips in order to earn miles and I feel confident that you know the way I am thinking!