Yeah, that't about it. Even if it looks that for example 110c per card is a waste of time, if you sell couple of them by the minute, profits accumulate. So much trading opportunity is hidden in the high frequency trade with minimum profits.

When relisting, copy paste 150-200c higher bin than bid. And don't do just any gold card, search the ones that actually sell. You can see it when last bin card is listed for 10-20 minutes - the higher the minutes, higher is frequency and profit per minute.