re: 3-5 yr commitments: that's how long it takes to exit a company. As a founder, I view the acceptance of outside capital as a commitment to return their investment. emotionally, i think you are signing up for the long hall when you accept investment
re: Greplin, i agree, perfect example of someone who actually didn't try to raise a big seed round at demo day, but capitalized over time after demo day, once he was more sure of what he was doing...i think that's the model to follow, not just raise because it's demo day, right?