it usually takes around 12 eggs for me to get what I want , and once I get 5 IV parents is easy to get more of them and then trade em for different 5 IV mons.
now breeding from scratch is something i wouldn't waste my time with. Or breeding one of those mons like Tauros that don't have females and are forced to breed with Dittos.
This is why I thank god for genners who are kind enough to spread the love of shiny dittos with 6 IVs.