I think it's crucial for a startup to have at least one person dedicated exclusively to marketing-unless you're exceptional, only having developers won't cut it

I think it's crucial for a startup to have at least one person dedicated exclusively to marketing-unless you're exceptional, only having developers won't cut it. Despite the fact that we're "Web 2.0"/new economy, you still face the same marketing challenges, and you absolutely must worry about market segmentation, sensitivity analysis, market channels, usability testing, etc etc. It seems that only in the startup space we're so divorced from the realities of marketing a product or service because our vision is clouded by mirages of exponential viral growth. If someone at Kraft or Chevrolet or Microsoft asked "Should we do market research?" they would be laughed at- of COURSE you should do market research, and yet many startups stuck in the false if-you-build-it-they-will-come mentality seem to think they could get by without even the most basic market analysis.