While I agree with you... I think Paypal is about as unique as it gets. See Paypal Mafia [1].
That company consolidated amazing talent (both technical & entrepreneurial) during the bubble, went IPO, which made many of many of those soon-to-be entrepreneurs wealthy. With cash in their back pockets, the started, fronted, and funded an incredible list of companies.
Ultimately, they utilized wealth, past success, and an incredible network to keep leveraging to build more of each.
1. http://en.wikipedia.org/wiki/PayPal_Mafia