The confusion about the limits is frustrating.
Wells Fargo customer service told me if I bought 2 tix in u2.com presale, I could only buy 2 more in the citi presale.
So I did that, for fear of tickets being cancelled.
But I see posts on this board or maybe another from users that bought 2 in u2.com presale, and 4 more in citi presale? That would have been perfect for me, but I didn't want to risk ending up with 0 tix after a cancellation for violating the rules.
If I get a code for the general sale, can I use it? Who knows?
(And I know I shouldn't complain, plenty of long time fans ended up with 0 tickets, so I'm in pretty good shape really.)