It's about the money and potential money that can come from the combos. Males can breed more than one female, but females can only breed to one male.
If you have 0.2 pastels, would you rather breed a pinstripe male or a bumblee male to them? You'd want the bee male to put to them so you can have a shot at Killerbees. Lemonblasts are ok, but you wanna maximize the monetary value and breeding value of the animals produced. If you get 5 healthy eggs from each female having 10shots at a 3gene animal is better than 10shots at only a 2 gene animal.
EDIT: as others have said though, if you're not in it to maximize profits then you don't have to follow this. It's not a rule or anything, just good business.
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