Micro NIche Site and Adsense Earning

I need a favour from BHW members. I want to buy a Micro MIche site but not have idea about it. If i invest money then it will be beneficial or not? I need your suggestions. If i buy this package how much the adsense earning per day.

Trail Package:
1 Micro Niches site
3 Unique articles
50 backlinks(PR2+)
Price: 35$
if any body have idea plz share with me.
Much Appreciated

there are SO many factors that will determine earning, its pointless to even try to explain. Go read some threads about micro niche sites, the amount of information on this forum is redicoules yet people are too damn lazy to look for it.