You are totally safe. I have a site with 10% CPR for over a year without any problem. Just follow the rules and you will be safe. BTW, that $1 a click is really nice! So it may worth it to work a little more! Try to make some tests to see if you can improve that CTR. Usually I am caring more for my affiliate ads, otherwise I try to reach 5% with GoogleAds on my sites, but in some niches this is really hard. Good luck!
Depends on what you do. If you BH.. buying traffic, cheap ppc traffic, etc. - Google knows everything. IT knows where the traffic comes from. CTR is great, niche is probably great.. Don't see a problem if it is all WH.
Nice earning and nice CTR. Don't worry it is totally safe if you don't click on your ads or ask others to do so.
It is normal. 1.77% CTR is really normal and I am getting the same CTR. Though your CPC is still a dream for me ($5 for 5 clicks wow )