i just got $38 for 2 clicks today (in 4 impressions - nice cpm). not sure if it was 2 huge clicks or 1 giant click and 1 normal size click. anyway, it's in a niche that usually gets around $2 - $3 per click. i guess it could be someone that's new to adwords or something like that.
The only automotive category with an active $23 click value that I can find is "automotive insurance rates." According to Keyword Country there are only 6 clicks a month on this category - so congrats on getting this.
I believe that adsense is such a kindle surprise chocolate. Every click is a surprise, you never know how you make in advance. They can cheat you, you will probably never know that.
Mine highest paid in single click was US$ 3.89. Your is US$ 23 are you sure you did not missed the >> . << dot or decimal thing in it as if it was US$ 2.3 and you mistook it as US$23.
Makes you wonder eh? Just what the HECK AM I DOING WRONG?!?!? lol Believe me - I can understand your frustration.
I can't believe. why don't you post the image of Google Adsense? Anyhow, my highest earning per click is $5.12.