What do people consider the benchmark in terms of an acceptable CTR? It would be interesting (so long as it's not breaching any TOS or anything), if people listed their avg CTR for the past month, type of site you have and any other information you think is useful. None of my sites have been running long enough for me to get much of an idea at the moment.
Well, in actual fact it would be in breach of the Adsense ToS to make your CTR known. You are only allowed to share your total amount of earnings.
Also, CTRs can vary dramatically from site to site, even within the same targeted market because there are so many variables involved. So any responses you get probably won't be too useful to you for your own site.
If your conversion rate is 100% I doubt Google would have any problem with 100% CTR. I'm guessing it all comes down is quality of your traffic, high CTR with bad conversion will make advertisers unhappy since they would end up loosing money.