CPA = cost per acquisition aka affiliate offers. I don't hate it, it's just the fastest way to ruin a good list if you don't know how to do it right. Most people spam their email lists to make a quick buck but ruin their asset in the long run. It's better to build your own offers and use your own list to promote them. Advantages: you are in control, you know that the service / product you are offering has value and makes your customer happy, your profit margins are way higher.