A photo magazine is looked at by people interested already in some form of photography. Not the public I expect to buy Instax.
What you expect is completely irrelevant.
Fuji is advertizing Instax in German photo magazines because they know that they can get new customers this way.
Their sales are increasing, so their Instax strategy is working. Period.
And that is the reason the shops around me do not offer Instax,. They do not expect their clients (reading those magazines) to be interested in Instax. And they think it not worthwhile to market it to a new group of customers.
The shops which are offering Instax are selling it very well. So if the shops in your area made the decision to ignore an interesting, successful product.....well, their decision. It is a free country here. Everyone can make the mistakes he wants

.
If two or three of the shops in your woods don't offer Instax, so what. It's irrelevant for the German market.
Because all the online distributors here offer Instax, including the big ones working mainly in Digital Imaging, like Foto Brenner, the biggest photo distributor.
Their photo catalog is printed in hundreds of thousands units, and sent to all their customers. Furthermore it is available in all the print magazine shops at the railway stations and airports.
And there are the Fuji Instax cameras and films offered as well, with product pictures. This catalog is a mass medium in Germany.
And in their weekly customer email newsletter they cover Instax as well.
Just today they advertised the new Instax SHARE printer for smartphones using Instax film in their newsletter.
That are the facts.
Regards,
Henning