It's more like joining a club, where you pay dues every year, and every year, they say, "We've added more features, and we'll sell it to you for $99."
연회비를 내는 클럽에 가입하는 것 같죠. 그리고 매 년, '기능을 더했으니 99달러에 사세요' 라는거죠.