Web sites exist for many reasons. Sometimes they have a web site simply because they think it's expected, which, of course, isn't a very good reason at all.
Individuals come up with a much wider variety of reasons.
There is, naturally, nothing wrong with that, and in fact sometimes EgoSites can be simply fascinating, though not always in the way the authors intended them. Still others may find that the web site becomes their hobby. Developing the site is the goal. There are sites that offer assistance. Free advice on how to tie-dye clothes, tips on favorite vacation spots, bus schedules, game rules.