Each trade opens more doors. The more trades you do, the more doors you’ve opened, for yourself, your clients, and their clients. This is a lot more motivating than just thinking about the impact for yourself. Say $20 of payment for yourself, is more than $20 of doors opened for others, and for their degrees of separation too - it is a rippling effect for those it touches - yet only a single transaction for you.
From @balupton and @ExplorerSumit