When they hold your buy in que for so long that the value changes so much that you need to drop your buy and get it again on the grounds that on the off chance that you need that coin, they don't give you the choice of getting it at your unique price tag. They do a similar when you are offering your coin. They clutch it until the point that the value drops so much that you need to change the cost on the off chance that you need to dispose of the coin that miracles me.