Lucifer was prideful and wanted to be like God, to be worshipped like God, he wanted to be in an exact position with God, and in his pride, he managed to influence one-third of the angles to his delusions and rebelled against God. Lucifer was one of the magnificent angel of God, serving God in His Holy Throne, yet he was not satisfied with his position & wanted more. So the problem is not about having 'more'. The problem is with the 'heart's discontentment'. That's why the Scripture tells us, "In everything give thanks for this is the will of God in Christ Jesus for you" (1st Thessalonians 5:18)