My medical sites got high CTR while for other sites, it is low. CTR depends on the niche and optimization.
mine is only $1 on 5 clicks.. to bad.. but for me its good that i see my site is earning.. even $1 /day. hehehe
Even though a high website price is not necessarily an explaination for a high traffic, I would hold back before getting scared when alerted that I have posted something against AdSense TOS.. No website name has been given, no names, no clues, no signature to grab a website from.. How on earth would Google detect their fraudulent customer?
Once you give the keywords, even if just 10 ppl start sites centered around that keyphrase, you will notice a nice drop in PPC rate