I've had an adsense account for about 8 months... and i've made ...$0.80 LOL! I don't get much traffic though because i've only just started promoting my site. Get about 36 page views a day... and that 80 cents has been over the last month or so... I know it's possible to earn a lot with adsense but $5000 a month seems a bit OTT!!
Quoted for truth. If you like your sites and you're passionate about your content, I doubt you wouldn't be able to make that. Try not being in it for the money, and the money will flow.
if the CTR is low, than I think the visitor is not real visitor.. because only real visitor can clik the add, robot can't do it