brinked - 11:38 pm on Apr 18, 2012 (gmt 0)
The list of 6 factors is not sorted by any type of priority. I was just typing them out as they came to my mind. I literally have hundreds of documents of notes and studies I have ran for the last 6-7 years on over optimization. I am even still finding loose papers from my office stuff of old notes that I could not open up notepad fast enough so I wrote them on physical paper, envelopes or anything I can get a hold of.
With that said, this list is comprised of factors that can hurt you if abused. It goes without saying that redirects for the most part are harmless but there can be instances where it can be abused. There are also many other circumstances that come into play as well such as the reputation of the domain you're redirecting. When you redirect a website to your existing business, you might receive the perks of doing so, but you might also take on any baggage that website might come with.
There is just too much to get into here so I dont want to dig too far into it. Penalties are a broad spectrum. There is no black and white, right or wrong. Most penalties go un noticed. Losing 1 or 2 positions in the SERP's might just be shrugged off as nothing, but it could very well be a minor penalty. Its those 10-30 position drops that make the little sirens go off in our minds.
Every site is different and every redirect is unique, it all depends on the site you're redirecting and the site thats receiving that redirect. It would be too speculative to go any further than saying that if this is abused, you will likely be punished. I have seen it and experienced it many times with redirects.