For me, the acquisition is a failure on all levels. Failure to execute, failure in reaching beyond one's capacity to take the startup higher, failure in self-belief. Even though one may have earned money after an acquisition, the real aim of a startup is to change the world and not to get acquired and die. But failure doesn't come cheap. For you to fail, you will need to put your heart and soul into the startup to succeed. And as spotman says "build something you believe in, that solves a real problem, and gain real traction", he didn't add that once you start getting offers for acquisition, stop believing in your idea and get lured by the offer and the riches. I personally believe in one learning from "The hard thing about hard things" book by Ben Horowitz, is that you should sell your startup when you have reached your max capability to take the startup to the next level.