Why want a miracle?

In John it says that to do the work of Jesus is to believe in Him - the one who was sent. It also says that the disciples sought Jesus out after the miracle of the loaves and fishes not because the miracle was a sign but rather because they ate their fill of the food. Hmmm. Why do we seek miracles? Is it for the miracle itself (healing from cancer or pain or distress, relief from financial struggle, redemption of a hardened friend) or is it as a sign that points to the supremacy and Lordship of Jesus Christ that we might believe more and that others might know that He is God? I think that Jesus is saying here that our greatest desire must be that He Himself would be glorified through the Sign pointing to Him ie the miracle.

Does that mean I cant ask that God heal me when I am sick because I have a big assignment due and I need health to be able to focus? No. I think rather it means that I should always be seeking first to see God glorified and be willing to accept that often that means I need to simply persevere and try to glorify Him in my illness by pointing to Him at all times and believing in Him in all things. When He does bring healing or other miracles to bear it means that I need to not focus on the miracle (Wow I'm healthy! Or look I prayed and got $200 out of the blue its a MIRACLE) but rather on the one who made the miracle (Praise God - He saw my need and He met it, He is so good!). I wonder if a change in focus results in more miracles ;)