I would hesitate to offer those sort of incentives for a few reasons:
You're setting up your relationship as paternalistic, if your affiliates do X, you will give them a prize. Some folks might come to expect a prize for every thing that they follow through on.
Prizes are fine, but as your group gets larger, it may become unsustainable and quite expensive. What is manageable to do for 10 people, may not be manageable for 100 people.
I would suggest perhaps some sort of contest, with a limited number of prizes that are within your budget.
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I would hesitate to offer those sort of incentives for a few reasons:
You're setting up your relationship as paternalistic, if your affiliates do X, you will give them a prize. Some folks might come to expect a prize for every thing that they follow through on.
Prizes are fine, but as your group gets larger, it may become unsustainable and quite expensive. What is manageable to do for 10 people, may not be manageable for 100 people.