This could be considered an idea, but it really just seems like a bit of bad math that could be corrected.
Piggy Eggs are worth 100 currants less than butterfly eggs despite using a very similar amount of bubbles AS WELL as potatoes and apples.
It seems that the amount of ingredients and energy for making each egg should be roughly proportional to what it ends up being worth, give or take fifty or so currants profit for your time.
Piggy eggs are a bit unbalanced. :)