I'd been wondering about this as well so you really roused my curiosity and I spent my walk into town this morning looking at all the daffodils around. It looked as if daffodils grown in rows all face the same way but daffodils in clumps all face outwards from the clump - the ones in my garden do this as well.
I've got two troughs full of "Tete a Tete" daffodils and was a bit miffed that they all came up facing away from the house. It didn't occur to me until yesterday that I could just turn the trough round to see what happened so I've turned one round as an experiment. So far the daffodils haven't turned themselves back round so now one lot faces towards the house and one away.
Maybe they are influenced by the direction of the light when they are growing?