Yes good traffic can make a difference.Though the amount is small but after the month it can be pretty good for continuous seller.
Simple: 1. Make 1.000.000 sales of 100$ and with 40.000$ in your account you can say you made a small profit. 2. If you place the link on your social accounts and you make 4$ ... how much did you worked. About 10 seconds to make 4$ ... I would love this job even if you don't make so much money!
The number of traffic determine the number of sales, if you get good traffic to your affiliate link you make very good money.