I personally like single gene morphs for the very reason that you can see how good the quality is of the specific morph. I am alright with buying a two gene animal but I want to see pics of the parents so that I can assess the quality of the individual gene. Once I have produced multiple gene animals I can move the single gene animals out that no longer fit my breeding plans. With the multigene replacements, I know where they come from and I keep photos of the sires and dams so there is a pedigree of sorts.
I've used this example before but I think it makes the point. Any YB to YB pairing can produce an Ivory, even if both YBs are lousy examples of the gene. You buy the Ivory for your breeding plans but wouldn't know the isolated YB gene is not a great example until you've already bred it into your collection. By that time it's too late. You've wasted the time it took to grow the Ivory up to be ready to breed, plus an additional year and a clutch on something substandard.
If you are going to buy a single gene than look for the best example you have ever seen or one that grabs you in such a way that you just can't live without it.
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