hmm.. may be you are smartpriced. Which means clicks from your site isn't converting well for Advertisers.
lolol, If you sent you 2000 visitors to advertisers and 50% each advertiser made $20+ on each lead or sale. Thats $20,000 dollars made by the advertisers and you get 90 bucks. This is theorectal however. But if you send a visitor to advertiser for 5 cents and they make a sale for $49.99. This is being being ripped off seriously. just look at the theorictal example I just showed.
It doesn't work like that. If there was such a profitable niche you or me or someone will find it and bid on adwords about $5 per click, or find the company and join their affiliate scheme. But no one I heard of gets a 50% conversion rate on sales - more like 1-5%, often less. Take a look who is advertising on your site, then go and see what they are selling, see if you can't sell it yourself if you think you're being ripped off.
if that what you can earn per day, it's already a good amount of money. Have you tried blocking those MFAs ads and other site that pay low? Definitely you might being smartpriced.
Bad niche, Smart Pricing, Invalid Clicks These may be the reasons of the poor amount of revenue you get per click.
There are a number of factors that can contribute to this. Smartpricing. We all know the story on that. I have a niche that was very popular 3 to 4 years ago and there were a ton of adword ads for it. Now, that niche is oversaturated with information and the ads have dwindled down to nothing, but a bunch of sub-niches (is that a real word?) have broken out for that keyword. Some of my keywords phrases pay well, but I don't get clicks on them. (I don't rate well for them on search engines for the sub-niche topics.) Others don't pay well but have a high click through rate. (I rate very well with them on search engines, but there aren't enough advertisers.) People's interest and advertiser's spending are moving targets. Search your keywords on Google. Lot's of Adword ads, great, but if there are only 3 Adwords ads for that keyword, you're in trouble. I'm just adding more sub-niche key phrases that pay well to my niche and expanding my site.
I think google is not crediting all of your click amounts, but still showing all of the clicks. For example, if you got 2000 clicks, but google things thinks that 500 of them are not valid, then they will not credit them, but they will still show 2000 clicks. It must be something along these lines, because it is not possible for an advertiser to pay less than $0.05 per click, and nearly all niches have competition driving the minimum bid higher. One thing you can do is change the content of your pages a little in order to get ads with stronger search phrases. For example, the term 'pc games' may only pay $0.05 per click (it's actually much higher), however, the term 'buy pc games" may bring in ads that pay over $1. Do a little research on high paying phrases in your niche, and consider altering your content a little to include those high paying search phrases in order to try to receive the higher paying ads.