Everything online has immediate feedback. not necessarily "reward," but we get some notion of "ok you're done now" even on things that involve a wait.

The real world demands delayed gratification. I planted seeds last week, and then nothing happened for days and days. Now they're beginning to come up. The link between last week's focus on planting and today's seedlings is something that I have to consciously remember, not the immediate feeling of "click muse, see square change color."

That lack of feedback makes the online fantasy worlds so much more tempting than the real.