Yes, I have. I have also been to hundreds of church services in a variety of denominations and I actually listen pretty closely most of the time. I haven't often heard much for reasons behind the rules other than, "God said so, Jesus said so, you will go to heaven and be with God, etc, etc."
All through the Bible we see the many characters of the Bible obey, disobey, do things right and make mistakes. We gets some pretty vivid illustrations concerning the results and resolutions.
What happened to David when he committed adultery and murder and then tried to cover it up?
What was the result when Abraham didn't trust God's promise and took his wifes suggestion instead?
How did things work out for Joseph after doing things God's way through the most difficult of circumstances and temptations...and weren't his brothers surprised at how it all turned out?
Psalms and Proverbs are loaded with advice, wisdom and reasons for it that still ring true.
Throughout we see example after example of people dealing so many aspects of life that we still deal with today from dealing with loss, hardship, money, power, marriage, raising children, dealing with parents, servents dealing with masters and masters dealing with servants (employer/employee?) and the list goes on.
We could go on and on from the begining of the Old Testament to the New Testament where Paul deals with issues in the Church.
This very day, we can look around us and see examples of the very same things going on right before our eyes.
I still don't understand how you select with parts to ignore in the old testament, but you feel that you have explained it as best as you can, so I don't think I'll ever get a good answer.
Did you look over the chart that I linked?