The reason is the discovery of http://web.archive.org/. Well, you could have known about it already, but I did not – and being able to see sites which are long gone, was nostalgic and memorable.
For those who have never visited this before, it may be a great experience in power of the internet. This site archives pages / sites [and changes in them] over years, and you can actually go back many years and see how things evolved for your favourite site.
For example, the first site I tried on was http://www.netprotraining.com/, a company I ran in 1999 – 2000, but then it folded and the domain name has been taken by somebody else. And, to my surprise, it spawned up not just one version, but monthly versions – between mid-2000 and 2001 [by the time I left the company]!