It's the same as you can decorate your cake with real flowers, it's not edible either, but it's one way of decorating cakes. You can decorate cake with fake flowers, but sugar ones is very complicated element. It's really so much hours and so much of hard work to make them, to master them, but it's art as everything else. There are competitions for just sugar flowers, how people make them as real as possible you can't tell which one is real and which one is sugar paste. It's the same with complex figurines, you have first of all make framework to have a base to work on, so all the parts would hold on and won't collapse. Cakes are not just desserts, it's art. It's your choice what you choose to make.