PGD is at present incredibly expensive, both in New Zealand and overseas. This means that it is generally only available to very well-off parental candidates, and that in third world countries it's hardly affordable for anyone. While services like this generally decrease in price over time, it is still likely to remain forever out of reach for a vast majority of couples. This logically is likely to increase the rich/poor divide, by allowing the rich to ensure their children aren't disabled and show desired traits, while the poor cannot afford to do so and therefore still have normal children and the regular rate of disability. I personally think that increasing the differences between rich and poor is detrimental to the world. This use of PGD encourages discrimination against non-PGD kids, and that counteracts my belief in the importance of equality.
Another ethical issue that PGD presents is that we have no idea what the consequences may be of drastically altering the world's gene pool. Entire traits may be eradicated, beginning with genetic disorders, but if people are able to choose physical traits such as hair and eye colour, this could lead to other genes being lost forever that could actually be beneficial to human kind and we can't know what negative impacts may come from that. For lack of a better comparison, it's like when dogs were bred to show desired traits and nowadays many pure bred dogs display negative effects of that, such as German Shepherds which are incredibly prone to arthritis, or Corgis which regularly suffer from back problems. We are completely unable to guess what the consequences of widespread PGD may be.
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