OddGoods review for Printful: Print on Demand

I sold three mugs recently for $51. After Printful deducted their product fee, printing fee, shipping fee, and taxes, my profit was $7. Who is actually making money with them? Combine very high prices with feedback I requested from customers who purchased my Printful fulfilled products recently ... "not up to your usual quality" ... "Print was off-center" ... "took a long time to arrive" ... "arrived broken". That's four too many red flags. Looking at options because I can't sell products that are merely "good enough".