"If you haven't maximized your status tier on one of your existing airlines, adding more Delta-branded Amex cards might be the way to go. With two Delta Reserve cards (one consumer, one biz) and two Delta Platinum cards (one of each, also), you can spend $220K amongst the cards every *other* year and earn 100K MQMs/EQMs in alternating years... just 25K shy of the new top-tier Diamond Medallion status and enough to keep you there if you add the other 25K by flying, etc."

I don't understand this method. I thought the card says one mqm bonus per skymiles number. Would you please explain? Thanks.