I am not sure to understand, from a company point of view, why a company should implement a cryptocurrency instead of the traditional loyalty program. And the same, from a customer point of view. Why a customer would prefer a cryptocurrency instead of the loyalty program.
Are you talking about a cryptocurrency that could be listed on an exchange? Or just a token usable on the site only. Because in case it's about a crypto I see a problem in. Let"s says the token triple or more within months, the company will so start to see reduced profits and so losing money.
Probably not. If it involves cryptocurrency then its not going to be very good for small businesses as it will be manipulated. But if its just for the product manufacturing, accounting and licensing and whatever, this blockchain technology will be one of the greatest of all as it can be traced back down to where and who the product were because of transparency.