You need to improve your CTR. Change your ad positions. Use the Large Rectangle ..incorporate some blended link units. What type of traffic is that ?
It really depends on your niche, unfortunately it is not really uncommon with adsense. I have a site that gets about 8000 impressions daily and makes about 5 dollars.
26 click give you $2....it is normal in low pay niche. By the way, your CTR is too low, less than 1%.
"How can I increase it?" You will have to try different ad units and you need to try different ad placements. Make changes and see which combination of ad units and placements give you best CTR. Ad units like: 336*280, 250*250 can help to increase CTR.
Your CTR is low. I like using 300x250 image ads but it all depends on the niche and the site..how about posting a link so we can check it out?
Stay away from the horizontal banners (i.e. leaderboard) since they suffer from banner blindness. Go with the suggestion from the above poster: 336 by 280 blocks preform best.
I've got channels with 0.20 CTR that do better than that. I think you're just getting stuck with cheap ads. I'm try a different format like everyone else is suggesting, though I suspect the result will be the same.
this is somehow a tip to increase your adsense ctr. you may read this article from quickonlinetips http://www.quickonlinetips.com/archives/2005/03/increase-google-adsense-ctr-by-500/
it is normal and acceptable. how much % of 4000 your 26 clicks? .65%. in that percentage you will get a low CTR%. its easy to compute the earnings just multiply eCPM and Impressions. note: impressions must be divided by 1000 you need to divide your impression by 1000 to get the result. for example i you only got 100 impression you need to (100/1000) X eCPM = earnings. i'll guess your eCPM hambles you only got $0.50 on your eCPM and 0.65% on your CTR. i always calculate my earnings to be sure.