a full blown icon package is ALOT of work, the first 10 are a breeze, when you get near half way, you start questioning yr sanity and keep saying things like........'why did i start this again?... but you keep plugging it out, and keep up with the quality of work you started out with on your first icon of the set, cause its expected, and no one like sloppy work. and also cause you know that the end will be in sight hopefully in a few days...
then when you get near the end, you feel greatful you are nearing completion and have survived another round of IP.
so I say again.......ALOT of work, thats probably why you dont see them very often.