EDIT: At least SpaceX and Tesla won the Crunchies instead of junk like Snapchat.
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[1] http://www.theverge.com/2015/5/6/8544303/casino-slot-machine...
It's always just about keeping the conversation. And since a lot of the conversation is filler that need not be saved forever, snaps have a unique position.
That bit is right in your face and rewards you for increased use.
Political wonks talk about it a lot and have various daydreams of having that type of power.
It's not talked about much, and when it is you can counter it by labeling it as a "kids these days" type argument.
Trophies aren't really all that unlockable. Within the app, any trophy you haven't unlocked is a lock icon with ??? underneath it, so you don't even know what you need to do to achieve it. You can go online to find out, but neither my 12-year-old daughter nor my 17-year-old sister have bothered to do it. They just don't care. That's not what it's about for them.
How long will it last?