Why should we have Corporate Prayer?

Why have corporate prayer?
I ask this so that you can comment.
Here is my story:
Our church started corporate one hour prayer services about 8 years ago or so. It started with maybe a dozen people each praying out loud in turn and then eventually it grew so that we just had everyone pray out loud or silently all at once all over the sanctuary.
We saw it grow so that now in 2007 there are 200-400 any given Sunday night.
Now, our Pastor, who has led us in all of this is discouraged. He feels clearly and distinctly that God wants the entire congregation (of which there are about 2,000) to come to the Sunday night prayer service.
Why should they? What is in it for them?
I have some answers.
We have seen actual physical healings, and not the TV type, but silent workings of the Holy Spirit.
We have seen broken homes mended, young people come back to God after a season of rebellion. We have seen older people revived, young and old men called into full time service. Many Many miracles. Anyone who attends on a regular basis most likely can attest to seeing or at the least hearing of a miracle from our prayer.
So, why don't more come?
Do we American Christians just have it too good? The rest of the World's Christians would kill to have our facilities and sanctuaries, and yet we waste them with more "good music" and "Beach Ball Sunday" and "Homecoming" and many other wonderful things, but none of these get to the heart of the matter.
"If my people, who are called by My Name, will humble themselves.......AND PRAY... then will I heal their lands".
It has taken 2 events in our church to get the entire congregation to come to corporate prayer: the day of and after 9/11 and the impending passing of our friend Kevin.
What will it take this time?
Why do people put baseball, football, tv, family, movies, lawn mowing, boating, etc, before coming together and praying? Do we have to have some really cool music to get them to come? Should we have maybe a dance hour followed by a quick prayer?
Why are American Christians so fat and lazy Spiritually?
I would love to know what you think?
If you come to our church, tell me why or why not come to prayer.
If you are not Saved, why?
If you are not Evangelical, why are we nuts then?
Is God satisfied with the 200-400 we are getting now? If so, why aren't other churches catching on?
Tell me.....