Agreed. We are called to spread the gospel of salvation in the Lord Jesus Christ.......NOT to tell others how much money we have or how big our home is.
How in the name of heaven can we preach "prosperity and money and things" to people who live in a shack made with 10 or 12 pieces of lumber and a tin roof.
When I see the money gospel and how Christians are to live in luxury I am pretty sure that those people have never been to the places I have been to share the gospel to the lost.
It is easy to preach prosperity to a group od 1000 people who all drove to the event in new cars and sit in a/c cathedrals.
NOW try doing that to a group of 1000 who had to walk barefooted, hungry and sit on the ground.
. You mean well, but you just don't get what I am saying 
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But because so many make it to be their sole goal in life, then it's a sin. That's why Jesus meant about the eye of a needle. Wealth and blessings are a result of obedience, faith and freedom from society/government. Three identical Christians in God's eye for example will have different levels of blessings in China, Africa or the West. Why? The governments. China cracks down on religious believers, Africa's leaders rob society and the West have prospered because of their focus on God. The UK, to America to Australia. Today, each are in various levels of decay and like in America will soon suffer persecution for their beliefs and that prosperity will diminish - not because of their lack of belief or faithfulness, but the conditions of the society in which they live. God will STILL bless and prosper in different ways within the conditions they find themselves. Would an ambassador lack anything of the country they're obedient to? Would a child of a King? Why would it be any different in the spiritual? We ALL suffer for sin... our own or those in authority over us. Freedom brings great physical wealth to those that are obedient to God. It's not a right, but a blessing. When freedom is removed, God's hands are tied because the devil has initiated persecution - just like what's happening in the UK and the USA. In those cases, the wealth is transferred to the untouchable bank of heaven. Don't focus on wealth, focus on Jesus. David said he never saw God's people beg for food. When society won't allow for food, He gives of His angels. Many Orthodox Jews (normally don't work jobs but study day and night) have found Jesus and are having money appear in their bibles and meager food portions never end until all are fed! That's wealth!