The Eggman

This morning I have just seen a man balancing at least 20 egg trays on his head. Those ones with 24 eggs in them. And they were all full. Clearly a man with supreme confidence in his own posture and strength but also in the lack of mischief in others not to give him a little shove (i was tempted but luckily i was in a taxi :-)). The thing is, though, that the top of the trays was a lot higher than the reach of his arms by a long way, so how does he get them down? Everytime he sells a dozen eggs does he have to take them all down and then hoik them back up again?