The airlines used to have plateau bonuses- extra bonuses at set milestones of flight miles. These rewarded people for continuing to fly after their chosen status level was attained.
On AA the PLT bonus is 100%, and the EXP bonus is 100%, so from a mileage bonus perspective there's no reason to fly twice as many miles to hit EXP, let alone fly >100,000 miles when there's nothing left to aim for. From an upgrading/service perspective, however, EXP beats PLT by quite a bit, IMHO, and I'll fly AA whenever posssible.
Then again, Flyertalkers might be a tad outside the norm when it comes to the drive to earn status on multiple airlines
[This message has been edited by landspeed (edited 06-11-2002).]