Even when I was living in a very liberal area, there were only a small handful of stores that advertised as worker co-ops. It's funny too because those co-op stores were all incredibly popular and successful, so I don't understand why they are so comparatively rare? The organizational structure seems simple to maintain, and has a high incentive for regular workers to go above and beyond since they directly benefit from the business being successful, so what's the deal? I am speaking from a US centric view, so maybe things are different in Europe, but even with my limited knowledge I feel like they are relatively unpopular there too, but maybe not? I dunno.
They're tricky. While they can be extremely healthy and successful, with extremely high employee morale, they can also be cumbersome and bureaucratic, as that's the power structure that replaces the traditional hierarchy. So, very much a pros and cons thing, they're not just exclusively more fun and amazing to work at.