Ok. bear with me, I will try to put the final nail in this coffin as best as I can, but this will be my last word in this topic.
I reread my initial post in this thread, and I apologise for not being clearer. The lack of details has brought much confusions about my message and I'm entirely to blame for this.
So here for all to read if they care, are the point by point reasons why I came into SL, followed by the reasons why I want to leave:
1- I came into SL to see for myself what SL was. I had never logged into any virtual world based games of any kind before, because I found them too limited in scope. SL appealed to me because no definite theme was imposed on the residents. It is up to each resident to decide what to do with what they get in SL. So I wanted to see what I could do in SL.
2- I know something about Zen meditation, I have been practicing it for a while. I wanted to carry this knowledge into SL and see what would result from it. The experience was enjoyable and I learned from it. I believe it was beneficial to a few.
3- I love to build stuff. It's part of my RL job. And I built some nice stuff in SL, Sorry you can't see much of it now, because of a "return all objects" incident. Anyway, I have a good idea of the possibilities of the world of SL in the building category. I have explored a good part of it, although not all. I have seen lovely stuff and the not so lovely. I have seen malls that are nothing but piled boxes with no flavors and beautiful themed malls build with care and artistry. But as in the RL the majority of build is selfish in nature and greed is the main motivation. Nothing wrong with that, it human nature.
That's about it for the reasons why I joined SL. No, I did not expect to make friends in SL, but I did make a few. And that's a very good thing indeed.
Now let's get to why I want to leave. If you are still reading It must mean that you are either also considering leaving or you like pain

1- First and foremost, I spend way too much time in SL. It's affecting my RL relations with my wife and family, stuff is not getting done around the house and there are many things that need to get done. I need to cut back radically on my use of SL.
2- Its hard to leave SL!!! The reason I spend TOO MUCH time in SL is because I get such a kick out of what I can "do" in SL. Notice that "do" is in quotation marks, that's because anything you "do" in SL is virtual, meaning it has no real existence. the buildings, land, objects, are all just pixels on your monitor. The conversations are not in this category because you are communicating with other people, not simulations. I have enjoyed the challenges of building replicas of RL structures that look real and also structures that would be impossible in RL. My imagination was stimulated in a way I have rarely felt before. And I increasingly had a hard time logging off to go to bed. Which led to reason #1 above. My wife was becoming a computer widow.
3- I did not just spend my whole time in SL building stuff. I also explored a good bit. Flying around in vehicles, as everyone knows, is an ordeal more than a pleasurable experience. If passing from sim to sim isn't trouble enough, you increasingly get un-seated from your craft by senseless "security systems" all over the place. That took the fun out of exploring SL very fast for me. And reading these here forums, I'm not the only one feeling this way. So I basically stopped exploring, I just wasn't worth the hassle anymore.
4- All through the past couple of months, my wife has very patiently put-up with my new "obsession". She calmly listened to my stories and descriptions of all the wonderfull things and people I discovered during the hours I spent totally "immersed" in SL. She watched in amazement as I lost over 10 pounds in three week because while I was in SL, I would forget to have snacks every 30 minutes. She loves me and she knows me. She knew this would not last, and that I would let it go after Iv'e had my fun with it.
5- So I was already starting to be done "having fun with it" when the building in question came into being, blocking a good chunk of the horizon. To most people experienced with SL, it would not have been a big deal, shit happens, things change, impermanence is the only permanent thing in RL as well as in SL... and all that stuff. But to me, it was just the last stone in my windshield. It was already full of cracks, this last stone shattered it.
So there it is, for all who care to read. Be also clear about this: I do not hold a grudge to anyone, not to the builder, who I respect for his integrity and character he showed me during the short conversation we had. Nor to the owner of the land whom I really should thank for kicking me back into reality. Nor to anyone else I may have bothered or offended in any way or shape through my actions or inactions during my time in SL. Just take it like I do; a great learning experience.
And this, my numerous friends, is my last post in this topic. I will probably still check the forums from time to time. Hell I might keep the basic subscription so I can visit the good friends I have made during my short stay in SL. They have clearly expressed their desire for me to stay and I find it hard to disappoint them. I know they will respect my decision to leave, as any good friends would.