well depends to be honestr a good aim is 2% i would say that perfect with my arcade ive had CTR up to 4-5% cus of ads and wher they was placed and my earning rockets but them my site gets crisized cus of they said my website was made for adsense ( bad thing). so i redesgined my website and now My returning visitor have grown bigger adsens ctr gown down to around 1-2% so earning have gown down but more returning vistors is what an early site should look for with adsense traffic first then earning after good look
I don't know why people concentrate on ideal CTR when it is not something under publisher's control. No doubt with ideal ad placements we can improve our CTR but working on something to get specific number for CTR sounds something strange to me. If you are doing everything naturally, then be calm what ever CTR you get. Thats my thought, might be wrong too
12% is darn good for an arcade site. Did you mean 1.2%? What's your secret? Using images next to ads? Care to provide a little more info?
Try to get arcade script where before you play some game it shows first 5secounds adsense ads and than only you are allowed to play, By this you can get stable ~3-5% . If need I have this script also...
The key is to focus the ads on the top of the page. The reader will be keen to read at the top and a lot of visitors won't visit the bottom or be interested in the bottom of the page. infilitrate and target the top.