I was actually in the process of turning one of my old time tgp's into what would have been the first adult tube site in 2005. Before I had even heard of youtube actually, when I first stumbled across youtube I thought "they stole my idea!"
Anyhow, I never intended to have full length vids, just sponsor clips in flash format and had the actual videos clickable to the sponsor site.
It was a ton of work and never really fully launched. I don't even own the domain anymore.
In 1999 I owned a free web host service, geocities style which I wanted to turn into a myspace style site but didn't have the resources or know how to pull it off.
Many more throughout the years.