the problems starting in that a lot of players just watch the transfer of the next 1-2 hours, if there was a fitting player. Or a unsecure in bidding to much when they double up the current bid, were as to bid a high minimum don't bite that much with search for a bargain.
You could make very good on all times, but you have alot higher chanches at uncommon times with less rivality on the transfer market. And the FA, don't get listed when a team is on and so there is no regulation of the demand to the offers.
And you always talk for real prices, the current prices are real, the prices with fa are very silly because there are lot more listening betwenn wednesday/thursday then the other days, but nearly the same demand the other days so you have jumping prices betwenn a week.