I do love the way that you are surprised by things which Poles find completely normal. I suggest you stay away from plac Bankowy: the shock of seeing two Spolem shops directly opposite each other might be too much for your heart to take.
As far as I'm informed isnt Zabka a franchise sort of, so that each individual owner probably has to have same goods etc..
That's basically true. The owner can also choose to sell additional products (from an 'approved list'), so some Zabkas have a much better selection of beers than otheres.
shadowy Mid Europe Partners
What is in the slightest bit "shadowy" about Mid Europa Partners?!