While many startups need less money to start, they still need money to grow
avc.com
avc.com
This is an entirely theoretical chart. There is absolutely no real data behind this chart. That said, it does reflect our experience investing in about thirty "web 2.0" companies over the past seven years.
FourSquare didn't grow to 2m users on $1m. Last month before they publicly closed their financing, they had 25 employees and were expanding (http://techcrunch.com/2010/06/28/checking-in-to-foursquare-a...). Maybe Dennis used his own cash but it certainly cost more than $1m.