So what I need is actually a best way to promote 500 pages per day that target very long tail keywords. For those keywords, 10 backlinks for each is more then enough, so I need the tool that will do this in a fastest way with some minor acceptable performance. My first choice till now is Scrapebox, I am also thinking about investing into Xrumer if it is faster. So I repeat I don't care much about the quality, I just need the fastest way to build 10 links to 500 pages. Thank you guys!