You can use the AMEX cardmember link and still get tickets, although not great ones. there were some 99 dollar tickets in section 432 about 30 minutes ago
From what I understand, they only allot a certain amount of tickets to the fan club members for the pre-sales. Otherwise, there wouldn't be any tickets left for the general public when they go on sale May 21.
How much you want to bet that a second Soldier field show is announced about 5 minutes after tickets go on sale Saturday? If it's anything like Boston, there will be another presale, (actually post sale) opportunity for fan club members.
Gazza, I don't think there is a potential for ALL tickets being sold during the pre-sale. Maybe only 25%? I think most people wait public sale. My opinion is that for those people who buy a 100$ membership should be able to buy their 4 tickets as long as tickets are not on public sale and the concert is not sold out during pre-sale. I think it's only fair.