I was doing some research on why one of my sites could have been sandboxed and suspected that a group of about 15 back links gave it the boot. I tried this on a couple of useless blogspot blogs that I have and sure enough, one hit the sandbox a week later and one was de indexed. These back links will take about 1 hour to create at the most. My question is - if it was so easy to get into the sandbox, wouldn't widespread sabotage be common. You can spend 5 hours and knock 5 competitors out with this method!!! I am obviously not going to share the nature of the back links because it is not something I do on competitors and would not want anybody else doing it on me. But I have been in the sandbox for a couple of months and I am pretty sure it is because of this. The blogspot blogs that I purposefully sandboxed have also been out for a month. I never knew Goolge could be so harsh on just a few back links.