Hi David,
I guess my answer would be, it depends. If I have a bunch of seeds out of a cross I might grow a few myself and share the rest with friends.
If a cross is something I think would be particularly good, I will grow all the seeds myself. For example I have a bunch of plants from the cross Riptide x Nightmare, which I believe will have some interesting color combinations. Another cross that I am hopeful for is Its a wonderful life x Heavy Metal. IAWL being a pastel colored CV is not particularly eye catching, but the flowers are big and beautiful. Heavy metal seems to pass on bright colors to its offspring, couple that trait with line crossing Fifth Dimension, I think there is potential for some bright colored and ringed offspring with that cross.
I would say if you have the space grow as many seedling as you can. Hibiscus are so variable that the ones that thrive from the time they are seedlings are more likely to do well in your climate. Saffron and Cosmic gold are two that seem to bloom really well for you, so at least a few of their seedlings will share these traits as well. You should also try to cross Acapulco Gold (as a pollen parent of course) as it has great pollen. Lots of takes with it as parent. As far as seedlings looking similar, as a rule certain color types are more dominant than others. CVs with a strong pink pedigree will tend to dominate the color of any other parent. For example look at Kristen's seedlings of Belle du Jour x Saffron, most of those seedlings came out pink. Red is another color type that tends to dominate crosses, so if you have a cross with those color types probably planting a few seeds is probably sufficient to see what the results would be. The most recessive color types are those in the blue and brown categories. Saffron as a parent seems to dominate most crosses in the yellow and orange categories, producing seedlings that are in the orange, yellow or red spectrum with white eyes. I think that crossing saffron to a brown CV will give you the highest probability of producing different color types as parent of Saffron, Misfire, is a brown colored cv. Examples of this include Creme brulee and Thanksgiving, both Saffron crossed to the brown CDLC.
There are also CVs that will give you a wide spectrum of colors from crossing with them, Creme de cacao is a great example. Tons of different color types come out of crossing with that CV, so I would try to grow as many as I can of crosses with a CV like that, which would likely give you many color types. Of course there is a chance of getting surprises in any cross, but genetics is a game a probability and depending on what you cross you can increase the probability of getting results you are looking for.
Good luck!
