If you sniped cards on the AH and then sold them for a decent profit, that account will be on a "watch list" because the mechanism thinks you are selling cards to your buddies. To be honest, it depends on if Help wants to help or not and I know that sounds awful, but it has happened to people for years now. There are some that do it against TOS, but most are people that just get caught up in AH sniping and selling.
This is why I do not do the Team Diamond set which should be coming soon and rarely buy cards unless I need to complete a set. I generally run an NMS team until after Easter as after that EA could care less in May-July due to low populated gameplay and they are not making that much in pack money anymore. Then I will try and find good deals on the AH for cards to put on the team.
They won't bother changing it. August-April is when they bleed people dry in pack money. They figure if they lose some legitimates along the way, it is just low casualties compared to the big picture.
