I love soft-boiled eggs, but never use an egg-cup. I like to eat them in a mug with butter and salt (yum!) or on toast. My English granny gave us an egg-cup from one of her trips back to England, but we don't use it: instead we put an egg she made in ceramics class in it for decoration, it's darling!
I'm from America, BTW, and because my mom grew up eating them (my English granny served "soldiers" for her) she never worried about making them for me even after any "scares" (I'm a child of the '80s).