@ehBeth,
They are not for topping eggs Beth! They are for purchasing and having in the house. In a word, posh. The ownership of such a device speaks volumes for the position of its owner in the general battle.
They are inefficient for a number of reasons but the main one is that the cutter is bound to get some yummy egg on it which looks to be more dangerous to lick off than it would off a spoon.
And at a large breakfast table with, say, twelve diners, by the time the butler got round to the last egg it would be cold and the person who it was assigned to would have had to witness others dipping their soldiers in whilst ravening with hunger and salivating like one of Pavlov's dogs, unless the others were polite enough to wait for all the eggs to be topped in which case they would all be cold and the egg topped first would be the coldest due to a portion of its insulation having been removed. Such a problem being easily solved by having twelve egg toppers which would have to be all different to avoid the imputation that a bulk purchase had been made and all the shameful consequences that implies.
Butlers are not supposed to move quickly. Inefficiency is the hallmark of their reputability. Their tailcoats are not supposed to flap about because it looks undignified.
And you can bet your house to a shovelful of cow muck, which has nothing to be said against it except possibly that it smells a bit and sticks to things easily, that there will be a range of egg toppers extending from the store those you display came from up to a culinary appliances salon in the Rue de Faubourg.
Naturally, I am not allowing for the chicken consciousness cult being in play because most people think it a leg pull. Not that I do of course. I think the chicken to be an ideal totem for an ideal society.