Interesting thread, my 2 cents worth:
My vantage point, is completely different because I don't fall into any of the groups above mentioned; not a BP, or PA or even a POSER

No, no wait, don't ignore me yet, I might have something interesting to say...
Anyway, I'm an end user, but a slightly different one. I implemented the IPO myself. And here is the first problem, how the hell was I able to purchase the system without any kind of Avaya training or authorization. The wonderful world of the internet. Went online, and purchased each component I needed.
I think this might be the first problem; anyone can buy the components and become a POSER, and start offering to install the IPO. Maybe Avaya should ONLY sell to authorized persons.
Having purchased all the components, I found myself in very interesting no mans land. No one wanted to know me. Avaya told me to go away cos I'm not a BP, nor do I have a maintenance contract, and the site which sold me the hardware told me to contact Avaya. "Serves you right" I hear you shout. Fair enough. However, in my research into the IPO, I did not come across the statement: Unless you are a BP Avaya will tell you to #$%$ off, not did the reseller tell me: "You're on your own". I made a presumption, that if I buy a piece of hardware (irrelevant if its phone systems) the manufacturer will at least replace it, if it was faulty and not tell me to go to a BP. Again, don't get me wrong, I'm not crying, I'm just pointing out that its too easy to buy the hardware and become a POSER.
I did a lot of research before I pulled the trigger on the IPO. I had quotes for just about every phone system imaginable. I want with IPO, because having read through the installation manuals I felt it was the only phone system which I can at least attempt to install and maintain myself.
I was successful, it was a pain in the neck, however I totally expected that because its something I never worked with before.
Now for the role of this forum:
I think this forum is fabulous, and I'm very appreciative of the fact that experts take the time to answer my questions. I certainly do the same, on other forums in topics where I feel I'm an expert. I certainly agree, that sometimes there are question posted here, which even I know where to find answers to in the manual. However, I don't think we should use a canon to kill a fly. Even though, you might consider yourself an expert, I'm sure at some point you learned something, from someone on this forum.
Fell free to flame me.