So much comes back to link weight these days that getting a good ranking for a given term is often possible but not always sustainable. While I search for the Google proof business I'm stuck with link management for a career...At the end of the day what I do is just that. Anyway I wanted to get some idea of what factors if any help a site to withstand large amounts of link building without getting it into trouble. For example if a site is 10 years old and has plenty of Google "trust" for want of a better word is it then "immune" from link attack? I've never attempted to nuke a site by adding thousands of inbound links but I'm sure it happens, I just wonder if your ever safe and if so at what point. I know this is one of those how long is a p1ss in the dark type questions but I am interested in how hard people go at the link building side of things and how good or bad their results have been. I never add more than 10 links in a day to any one site that I care about, that is my own personal limit on my "marketing" activities.