adsense stats after 6 months show any potential?

Hi there! I've had adsense on my 'fairly new' site for 6 months now and was wondering if people could take a look at my stats and see if they think there is any potential if I keep on working at it. My analytics shows an average bounce rate of 60% (which I'm working on with a new homepage design) 3 mins spent on site and 3 pages per visit.

My best month so far had 2800 impressions, 31 clicks, 1.1% CTR and CPC of £0.40 with a total earnings of £12.27, Now I estimate 10-20% of those impressions were me when building new pages & refreshing my browser etc so if you deduct that the CTR would be a little higher.

I suppose I'm going for the authority site model just building it around what I like & know, The site has a PR1 and is well over 150 pages of good quality unique content now and I try to add a new page at least every other day.
My ad units are a large rectangle placed between title and content then another wrapped rectangle at the bottom of the article plus a skyscraper in the sidebar (and maybe a link unit in the middle of the article if it's a big one)

The niche is fairly broad and competitive and the keywords I'm trying to rank the homepage for are going to take some time I think. My question is if I continue to develop the site, work on traffic generation and hope for the possibility of long tail traffic from my inner pages in the future is there a possibility for decent earnings?

I'm ranking between first & third in G for one keyword which is where most of my traffic is coming from. If I was to stick with it and for instance replicate what I have done in a month for a single day i.e generate 1000 visitors a day at 3000 page impressions then I could be earning £10-£15 per day which would be a nice 'start'.

As I said the niche is quite broad and the potential is there to branch off into other avenues from the one site once it gains a little authority. However I just don't want to be wasting my time writing articles & working on backlinks everyday if it's not going to go anywhere! I know there's no definitive answer and it depends on a number of variables but with the info I've given & the adsense stats is there some potential there?

Thanks in advance, Joe.