After using Adsense for a year now I notice how others use it. I understand there are premium users but I don't know if they let you use 4 or 5 codes? If not it's weird to see a top site using 4 ares of adsense and then a small junk site is using 5 codes. I know google can't view everything but it makes me nervous to even try because adsense has been ok for me.
Stick with 3 buddy as it's far better/safer to do things correctly. If it not broke don't try and fix it. Thanks Brian
i think people are using frames for adding 5 or more ads. but it's against the tos. most of them are being banned in short times