Customers who have niche shops, selling similar products can build up their facebook pixel.. And when they advertise new but similar products, to new people, the pixel will use the audience information it has acquired before to more effectively target the right people ( people like those who ...
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The way I understand the FB Pixel is that it makes a note of every user who have previously visited your site, so that when you go to advertise on Facebook, it will show your ads to previous visitors of the site. If the user comes to your site in May and browses for a bit - the pixel makes a note of this. And when you decide to run an ad (e.g in August )- the pixel remembers users visited your site before , and FB is more likely to show your ad to those users than if you didn't have the pixel installed. This should work well, regardless of if you're a niche or just a general store.