Extravagant Giving and the Sin of Hoarding

I have been pondering the sin of hoarding lately. I like security, and often I find security in keeping things around me – whether I need them or not. My stuff can cause me to sin. One thought that has surfaced was: 
how does “waste not-want not” work when “the Lord is my shepherd, I shall not want”? 
I understand that wasting what we have (food, possessions, resources) is equally wrong for we fail to properly appreciate and use what God has give us. 
However, when I refuse to give away or let go of a possession is that displaying a sinful attitude of trusting in my own riches? Could this be a concession to my desire to be self sufficient instead of dependent? Is it a blatant rejection of accepting the reality of my need for “daily bread”?
The Scriptures are full of extravagant gifts given to glorify God, but criticized by others. Perfume upon the feet, a feast for sinners, a dance before the ark, a temple of incredible dimensions, a new robe for a lost son, a life laid down.
These individuals did not refuse to give, and give extravagantly.