Usually, it’s great when people are passionate, loyal users of a web service. You can count on them to visit, provide feedback, and keep the faith when you go through hard times and change things - they’ve got a lot of forgiveness for your brand and service. New and casual users are trickier - they demand more in the way of stability and performance, weirdly (you’d expect it would be the loyal users, though, wouldn’t you?) and you have to work harder to earn and keep their trust.