1) They take a 50% cut on your adsense earnings
2) Not ranking well anymore...
3) They take down your hubs for some really silly reasons and worse, they refuse to reinstate them despite all the changes that you have made to follow their guideline
4) No one got rich writing for them
Enough Said!! Frustration Vented!! Quoting Ben, if you are going to write for them, might as well just give them your resume...:p:p