Finance is very competitive! It may be a lot of work to get up there in the rankings. But if you're getting that amount for clicks and you have the time, it just might be worth it.
If you choose the right keywords with the right amount of traffic then it will be easy to accrue earnings from adsense within the niche topic of finance..
I once got a click worth $18 on a loan related site. That's one of the top paid niches, so no surprise.
this is not a very big value but great. everyday im getting this king of clicks. also i saw some one got about 10