SangP:
Darnold9999,
I know that accidents don't happen often but when they do it just takes one. Are you willing to bet your life that you'll never encounter a situation where you won't be able to handle alone?
Having a reliable buddy just reduces the risk but never negates it. Basically this thread is about risk reduction and by having a more reliable buddy as opposed to having one that you'll be better off without.
If for nothing, having a reliable buddy equals peace of mind, I'm all for that.
SangP
Short answer - yes I am willing to take that risk, but I would like to know what that risk actually is.
Long answer, yes but as with all the other risks I take in my life I want to have all the facts when I evaluate the risk. At the moment I really don't have any facts. All I have is the recommended practice in a sport that is quite new and has evolved quite significantly since I started. My first 50 or so dives were without an octo and that was considered normal and safe practice at the time. Things change, I want to know the reasons and the evidence - the fact that everyone does it or says that you should really doesn't mean much to me.
I don't see any research or statistics to back up the position that diving with a buddy is significantly safer than not. I don't disagree that it is safer, I just doubt that it is significantly safer once you get beyond a certain skill/experience level. My arguement is that other factors are way more significant in predicting accidents than buddy/solo, but this also is not based on any hard evidence, just intuition.
I take all sorts of risks that I could mitigate - I choose not to for various reasons. We all do. We perform a calculus re risk vs reward - not diving at all would be far safer than diving. Am I willing to take that risk - you bet, the rewards are worth the risk. Will I dive solo, yes, I think the rewards are worth the risks. I know what the rewards are, but I don't really know what the risks are in a quantifiable way. Don't think they are as great as they are made out to be, but really don't know.
Common sense tells you that buddy diving is safer than solo diving. No question, no doubt, and my common sense tells me to dive with a buddy unless I have a good reason not to, so I almost always dive with a buddy. If nothing else it can be more fun.
However on a completely different topic, I always dive as if I was not able to rely on them. If I can, that is a bonus but I feel much safer diving thinking that I need to rely on myself first - the buddy is just an added bonus that may or may not make a difference if it hits the fan. Does not mean that I won't be there if the person I am diving with is in trouble, just means that I will not assume they will be there for me. My view is that this makes me a safer diver YMMV.
Knight - if you ever get to the PNW we will have a beer and maybe go diving. I think I actually am a good buddy to dive with, but that may just be in my own mind.

On the commercial front, you are diving well beyond rec limits as a commercial diver. Very risky dives so that the risk of an accident becomes quite significant and having a backup diver does in fact mitigate the risks significantly. As I said in my initial post - I will pass on those dives.
I do know that taking pictures makes me less aware of what is going on around me - still pay attention, but less. Means some will not dive with me. Their choice.