Sales generate income
They sell goods and services that are already known to the selected market
Sales is tangible and is easier to reward for. Marketing is harder to track and thus harder to compensate
Sales are generally the easiest to measure and therefore, assign a value to. Marketing is about creating the environment for sales, and generally more difficult to assign a direct dollar value.
Commission based
You actualy going to consume in marketing, where in sale is the result of marketing
