Brother, you are completely right except for one thing.
Dua is our most valuable treasure.
And we only make dua to Allah SWT, and NEVER to angels, prophets, other dead people, etc.
ONLY Allah SWT that can make all our duas come true if He wills.
And we already have a section where we ask our brothers and sisters to make dua for us:
http://www.islamicboard.com/general/...st-thread.html