The cost of adding a feature isn't just the time it takes to code it. The cost also includes the addition of an obstacle to future expansion. The trick is to pick the features that don't fight each other.
“Publicity gets more than a little tiring. You want it, you need it, you crave it, and you're scared as hell when it stops.”
“Nothing changes more constantly than the past; for the past that influences our lives does not consist of what actually happened, but of what men believe happened.”