Founder of @vacordprints. Working on new marketing tools. I like sandwiches.
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Rewards can be structured in a ton of ways (one time reward, recurring, percentage, flat, etc) and it's good for any business model, not just SaaS.
And you're right, they are almost always cash rewards instead of service rewards like Dropbox does. That is more of referral marketing than affiliate marketing.
Let me know if you or anyone else has more questions!