Belt mining would be more fun if there was a chance of something good happening that makes you want to stay for “just one more asteroid”. Perhaps emptying an asteroid has a chance to drop something good - something for miners to look forward to.
Sites have this with random faction spawn and faction drops. Other games might have this say in the form of fishing where you never quite know what you’re going to pull up! So just one more fish! Mining would be more fun if you never quite knew what would happen if you just stay for 1 more minute in the belt.