If there's a place where only good things happen, those good things would then by definition become mediocre. You'd not be able to appreciate good things if you didn't know what bad things are.
Perhaps the way the Christian concept of Heaven works is that you've lived a life where you've experienced both good and bad, and then hopefully earn an afterlife only with the good. Because you assumedly retain your understanding of bad things that happened when you were alive, you can appreciate the good things that are happening everywhere now that you're inside the pearly gates.
However even if you had an existence where nothing seemed bad, you could still find a way to appreciate good things if things were able to get better. For instance, if you lived your entire life without the taste of roast chicken (or vegetarian equivalent, because I'm open-minded like my hero che), you would probably still be pretty happy. If nothing else ever changed, the good things happening would become stale. But then if one day you are introduced to roast chicken... boom, without anything bad happening, you're able to appreciate some more o' that finger-licking goodness. Maybe that's what explains Apple's success in selling crap phones that are only marginally better than their predecessors...
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