I wrote about an increased offer for 30,000 Membership Rewards points for the AMEX EveryDay Preferred on CardMatch. Nearly 3 weeks later, the offer is still alive and kicking. And so are other increased offers for AMEX cards. Here’s a round-up. AMEX Platinum Major draws: Centurion Lounge access Access to AMEX Fine Hotels & Resorts $200 annual…