It really depends on what you are planning to do with them. An unregistered GG will never have offspring that is registrable in the pure GG section, even if you use fully registered GG males in the future. Cross -bred milkers can be very good, but unless they have been bred with milk production in mind rather than just using the nearest billy goat for mating, you have no way of knowing, so would not be able to buy with confidence.
If you just want to produce milk for the house and are not bothered about registration etc, GG kids will always be easier to sell than cross-bred ones, but I would keep to using pure GG boys to mate to.
And all goatkids are cute, but GG's are REALLY cute.... so there is my opinion.
PS.: I do breed GG's... hopelessly addicted.