While the application was doling out some serious cash for Spotlight content creators in a bid to get more people using the app (because TikTok's absolutely crushing it) there really isn't any type of reward or prize for maintaining a super long Snapchat Streak.
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This might seem like a bummer, because even Google was giving out socks to "local guides" who chose not to ignore their Google Maps application's prompts to leave a review of the spots they've navigated to.
The only thing users really get are special emojis beside their friend's name to signify their devotion to talking to each other every day, and there are quite a lot of them that denote specific messaging parameters that you can check out here. Personally, my favorite is the Golden Heart one: that means you message that person the most on Snapchat and they message you the most.