I think your experience is atypical. Most people I know who work at startups, myself included, got their job through a personal introduction to one of the founders. We have one employee whom we hired from Monster, but he wasn't specifically looking to work at a startup; he just applied for jobs that sounded interesting regardless of the size of the company. I don't know anyone who has gotten a job at a startup by sending resumes to twenty of them and getting lucky on one.