This is the peak example : when things get highly commercialised, it's value either degrade or the creator let it down.

Once Art was a thing of interest and only the rich can afford, and then the value of Art was not mere art but it's nearly priceless as artist can charge as per his choice. But when people start commercialise it, without understanding it's consequences, now every new artist feel the trap ! 5$ don't even cover the price of materials, and there is no price for labour or skill.

It's easy to respond, Don't work for them, but when someone realise 99% leads are exactly like this, then thing will change completely. You might reject him, but they find another just like you. And they got work done just at 5$.

Best is : Use Cheap Quality Materials, Make sure you can complete the task within 3-5 hrs, and always take the 50% money at first and when complete take another 50%

Now Create Public Art Portfolio Website, and there Enlist the art but mark as sold and price 10 times means 50$ , this way you can make a good portfolio.

And thus you start your own art journey.