Fading Away for Any Good?

As the years go by, Siddhartha starts getting more and more wealth. He's now full of valuable things he never had before. He becomes replaced by more material-like qualities. He grows greedy, troubled by everyday problems, and unhappy. He feels trapped by pleasure, pain, and a sense of self-hatred. Before all this richness he thought that rich people were, " discontent, of sickliness, of displeasure, of idleness, of lovelessness." But, "Slowly the soul sickness of the rich crept over him."
Siddhartha reached this point of richness and discontrol, that his Samana qualities start to fade. He starts gambling and showing-off his wealth that it "finally trapped him." 
Why would someone want to have lots of wealth when he or she won't even recognize himself? Will Siddhartha wake up? Why is Siddhartha being so bipolar in the case that sometimes he thinks that what he's doing is bad, by hating himself, but he still loves his new wealth and "new life"?

I interpret this photo as the money being Siddhartha's wealth, and the key being his key to life. I think in Siddhartha's situation he needs something to chose. If he can't be a good person with wealth, I would prefer he keeps his normal Samana life. He's not having a healthy life because of a wealthy life. 

Chapter 7, Samsara