What an interesting conversation. I'm still brought back to the question about your original quote: Make a greater effort to what?
While it's true that our struggles forge our deepest insights, growth and noble character traits, I'm not sure wealth has much to do with that. The 'spoiled' children may have their own struggles with self-esteem, parental relationships, etc. to go through.
On the other hand, don't all of us on a board like this (about personal development, growth, insights) want to teach what we've learned to our kids?
I, personally, want to enable my daughter to experience a life of wealth, freedom, and abundance in every way. I refuse to teach her that she has to struggle for everything - I teach her that she is in creative control and that she can create EXACTLY what she wants. I also teach her self-responsibility (a core trait in conscious creation) and appreciation, so there is no spoiled brat-ness going on...does this mean she'll have things easier? Possibly...BUT a) I believe she'll have her own growth-inducing challenges no matter how I try and prepare her, because that's life and b) if we are all trying to awaken to our creative powers and live magnificently abundant lives, then isn't what I'm doing contributing to this human ability - on both a global and a deeply personal level?...
This is just a bit of what comes up for me when reading this. Thanks for the interesting thread.