I think Whatever we do is for a return. the return can be a monetary return , self-satisfaction,happiness, better hereafter etc.
Walikum Assalam.
Yes, to a large extent, it is done for a monetary return and better hereafter. I would say all of these are biggest reasons but a "monetary gain" is not equal to "self-satisfaction". Sometimes it is done for no return and this is the other side of the coin. When it is not done to "show" other people, when it is not done for "monetary gain", it becomes an inner satisfaction which also translates into the no return category.