I bought an imported gravid female that layed 5 good eggs, 6 slugs. The 5 eggs may or not be fertile.
I have read from bigger breeders that adults like this that are imported can be difficullt to breed in the future, I think it was three years in a row so far that this one particular imported granite didn't lay fertile eggs.
I bought gravid for the experience, not for making money. Also remember the female could be VERY hard to get to feed. You should have a supply of asf's if she needs it.
And finally, imported will have internal parasites. Plan on at least one vet visit and a round of Panacur.