You really can't increase it personally, more clicks per 1,000 page impressions will make this figure rise. You can try using different ad units and color schemes to see if you can increase your eCPM.
So, your eCPM is averaging $1 - $2? Well, if your site goes up in traffic and has bad ad placement, then your eCPM will go. You need to have good placement for it to increase - as well as more traffic. Depending on the advertisers in your niche in certain times, you might see higher eCPM rates.
I forgot to mention, one of my sites gets around $0.11 eCPM average daily and still earns $40-60 a day
Here is rough estimate of data from yesterday, to comply with TOS. Earned: $47.33 Impressions: 300,000+ Clicks: 429 CTR: Around 0.15% (+/- .1%) eCPM: $0.15
Nah, this is my humor site and I'm EXTEREMELY happy with where it is compared to other webmasters I know in the humor niche, soon I'll be launching two more sites, one for videos and one for jokes with the same concept as now thats humor and I expect the same results within a year of them being live. Don't forget nowthatshumor is #2 for funny pictures and #4 for funny pics on Google SERPs so I can funnel a lot of traffic from that site to my 2 new ones