I used to live on Adwords. Used to spend about $500 per month. I have no doubt $200 of that was fraudulent clicks from one or two competitors I would call mentally ill. I am very low key on Search Campaigns for that reason. I would say I am doing pretty darn good with Display Ads. Terms like Carpet Cleaning do little or nothing. One of my best keywords is weather. Call it spamming, that's what it is, that's how it works. Make a compelling display ad. We are at about $200 per month and see about $1,000 in sales from Adwords. For what it is, that is good. It will not make you rich.