I suppose i can only speak for myself on this one. It seems that every thing in my life that has caused me pain and suffering, has always led to a greater understanding of life, myself, and most importantly (to me) has helped me have compassion for the pain and suffering of others and tolerance for others life paths.
Perhaps the last reason is the reason why we do suffer, that and for the experience-knowledge. I am inclined to believe that maybe there are only two states of being in our little Earth marble game--Love and UnLove. All of us have experienced UnLove to greater and lesser extent, and true for Love to some degree as well. But very few experience PUL energy (pure uncondional love) in any deeper or consistent way from others here in-physical. Nor do many of us consistently project and live it. Perhaps that is a generalization, if it is so sue me
but seriously if we did (love more) the world would be in much better shape than it is in right now, right?
I believe everything that has been a challenge, painful, disillusioning etc. has been a catalyst for me learning to put that energy out more and more. For example, I consider my step-father my greatest teacher, even though he never consciously showed love and was quite unloving in many respects. When i learned to forgive him entirely and fully, i learned a higher expression of love. And in turn, a weight lifted off me and i became a happier person.
As someone mentioned earlier, i believe it was Alysia, many people who seem to "have it all" and who seem happy, are really some of the least happy people on earth. A good example is Howard Hughes, a man who had everything materially but gained it all at the expense of his soul--which eventually drove him nutty (well that and the drugs).
I've met some very "down and out" people who have had a radiant happiness and positivity to them, judging by the worlds standards they should be miserable, but when you live and function from Spirit regardless of your material circumstances, you seem to get other "benefits". True in my case as well. I'm fairly poor materially, sheesh i have to use a library p.c., but i live almost everyday in consistent joy, peace, and gratefullness (though i can have quite a short but not lasting temper) and i wouldn't trade this state of mind for all the fame and riches that our western culture so glamorizes. Though i would be lying if i said i don't sometimes wish i was a little better off materially.
But then again, i've always been somewhat of a Buddhist in my attitudes toward material life. I dunno, but i've experienced some pretty powerful extremes in this life and its been quite the ride so far! Can't wait to see what else is in store...