Well, I believe I had been. I got an autoblog on a health niche. It was on position 1-3 when I did a few highly targeted keyword search. Of course, since the niche was still new... I kinda left it on its own. I did built some massive backlinks to keep its position there. Then about 2-3 weeks later, I tried to do a keyword search and realize my site is no where to be found! It is still indexed because I still see my site when I did that (site. But now it's completely wiped out. It's not in the top 10 SERP! Damn.... fortunately it is a site that I didn't care much.