I am fairly new to adwords etc but have been running a successful campaign for a year now. My ROI for my campaign has been slowly dropping and I just figured that this was because the new was wearing off the account (I head that they give you higher billing etc for new accounts until they have enough data to know where you should be)
But then in March my ROI dropped though the floor and went negative! I'm pretty clueless and don't really know where to start to fix things. I have paused the campaign because I'm just throwing good money after bad. My monthly ROI was as follows:
Oct 12: 561% Nov 12: 425% Dec 12: 251% Jan: 13: 266% Feb 13: 198% March 13: -32% April 13: -12%
Hoping I can get some help - I have no idea what's going on!