Business fans/buddies

While setting up a business directory, I would like each business listing to be able to maintain a buddylist/fan base. SO for example if a business maintainer has new stock, they can simply email all the business fans/buddies.

Now the problem is should I let "businesses" be "groups", with a custom group/business page, so users can join(become fans) of a business, thereby automatically being able to opt in/out of mailing lists.

Or

Should I create a CCK node-type and use usernode to make use of the buddylist module. (not sure how this works though)

thanks