Your target basically is to get many people going for your product, then you sell for them. The passion pages created can be used to market your existing products; any value giving product/brand, the need of the people will definitely call for the mind to buy. The interest of the audience will determine the success of the page, If the passion page receives sufficient interest, product development could spring up.
There is quite a difference between purchasing a particular product than liking a page or sharing a post that is found exciting and helpful to the reader like your page simply means there are possibilities of winning this reader to your side and becomes consistent commenter and joining your fan base. I love to write on health and I choose health niche and working in the health niche. Your idea does it because you must have the mind of your audience, if you noticed a particular problem at is very rampant, the solution can be given and more enlightenment through your post and article. Choosing a topic like a launch recipe.
Everybody would be expecting related topics to be discussed. The main issue is having great passion concerning the niche and giving the needed information that will call the attention of the people. It is very sure the expectation of the audience will be very high, then you will create a passion page on the topic, and immediately we've succeeded in developing a fan base, the test on the launch recipe shall be tested to discover the mind of the people. Any positive result then the product franchise would be out.