I think it can be, but I think that to be a "good" breeder (not necessarily profitable or professional), you need to breed animals that improve on the previous generation in looks... For me, 2-3 gene animals seem to look the best, or really good examples of 1 gene animals. I have only 2 BPs at the moment, a 1 gene and a 2 gene female. Of the two, the single gene female is a better example of her morph, so it makes sense to me that she should produce better looking babies than the 2 gene animal, although I will get more combos with the 2-gene female.

I think you need to start with solid examples of the morphs (1,2, or 3 gene, etc.) then build your collection from there... Keep back the best examples (i.e. keep a 1 gene awesome pastel over a 2 gene mediocre bumblebee), then breed quality to quality striving for some aesthetic goal... i.e. reduced pattern, more contrast, etc. If you become known for quality, it makes sense that more owners will come to you for breeding stock / pets.