if you're only looking to make 1k i wouldn't build a saas i'd build bootstrap themes and sell them on sites like themeforest etc any similar kind of thing you

if you're only looking to make 1k i wouldn't build a saas i'd build bootstrap themes and sell them on sites like themeforest etc any similar kind of thing you can sell, a wordpress plug-in or something that does something people are always looking for you'll have your 1k in short order