When HS explained it the concept was to get as much genetic variation as possible. Your way past minimum eggtake with the tray rack full and after picking you take so many from each tray until you get your number. Now that means you dispose of the eggs not needed but the number of females & males utilized goes way up because you only take a % of many vs few which is the idea. Widen the gene pool not narrow it. Not much more in actual cost either.