The reward amount and who it is visible to based on profile information is up to the merchant, we envision many different use cases for many different types businesses so I am sure the rewards while vary, maybe only a $1 worth at a ice cream store, or maybe $200 for a RE sale open house
The game platform must be probitable for users that people will play in it. Do you understand this? It is very important to attract the users to the platform and profit is the best reason to do this.
Also it is necessary to remember about the competition on the market. And I think that games must not only be profitable but also interesting for the gamers.