On the Web, it's nice to share things you've made. Even if they aren't the best in the world, your sketches and paintings and photos are yours. That makes them intrinsically interesting to people who know you. Hi, Mom!
And, you never know when something you have handy might be useful to someone else. If it's here, perhaps they can find it; if it's in your attic, that's less likely.
Tinderbox made it pretty easy to build a simple picture gallery. It took a couple of hours on a Sunday afternoon, hours when I might have been painting had my studio not been torn out to the rafters for rebuilding. Maybe, next week, I'll do a Tinderbox-Flash gallery.