Adsense + Product Niche is DEAD?

Every time im doing product type keyword research, i have seen top 10 ranked on Google are ecommerce sites...
Is it still worth for me to make some money from product type keywords???
If the kw is not worth, what type of kw good for adsense in 2015??
informative kw? guide?
My head blank now @@... just wanted to earn from adsense back in this year and feeling empty @@"
Any tips will help me to make my brain functioning back

I'm ranged 1st or 2nd for 1000+ luxury watches products in one niche, and 2000+ in moto-stuff and fashion niche.
With good content, you can win the world.