Never have I heard so much self supporting drivel for the rules of commerce as an example, or parable, to teach not rewards on earth, but rewards in following the lead of the church. The lesson hints, do what you're told in the name of god, and you'll be rewarded on earth.
The parable teaches, as tertiary history, do what you're told, and you're rewarded. It supports authoritarian lead-followship, by mixing apples and gonads--bribing the doer with riches as a fallout from doing what is told, using the attraction to money and riches to dupe goats to obeisence. The parable is meant to indicate being a good steward and doing what you're told by authority brings riches and rewards if you're obedient, and if so, you'll enjoy financial success, even that financial succss, is an indicator you're doing "it" right, namely selling your free will to the church.
Wealth and riches are only a tool, they can be used by men for good or evil, Like unto food or drink it can sustain life or destroy it depending on its use.Wealth can build up a community or destroy it. It can be used for moral causes or debauchery and destructive causes,it can inspire hope or despair. "What does it profit a man if he gain the whole world but loses his soul" Matthew 16:26
The "render unto Caesar" line was put in by the King James scholars; it's not in the original Aramaic or Greek - and it was put in there simply because King James wanted to be able to collect taxes without so much fuss.