Golds are hard to flip especially cause of that 10% fee, I would say for silvers if it makes you ATLEAST 100 stubs after the 10% then its worth it but the most flipping and highest returns are all in the bronze
Cards fluctuate throughout the day so at sometime they are going for nothing then they go for triple their price, if your card has no value anymore somehow, just hold it, or convert it into silver/gold through exchange
