One thing I like about having online games is that you can update them as you need to, whereas with a print version, or even a download only game, you have to release a new version or a patch.
Recently I updated two of the online games. The first, The Great Desert, now has a picture to go with each encounter. It makes the game more viscerally appealing, and therefore more fun.
The other game I updated was The Subterranean Realms. When playing through it, I noticed it dragged a little, so I made your hero gain better bonuses from fighting harder monsters, heal up to full more quickly and automatically defeat weak monsters. All in all it goes quicker, with less 'dead spots', which makes it more fun.