This summer, they finally got a client in my market, and a store I love, at that. It is the only thing I have ever seen for them for this area. I applied for and got a shop, got a 5/5 rating.  I have done 4 more shops since then, all 5/5 rated.  I applied for 3 more, and I wait. They have been sitting there in request status a few days now; this has been the case with the others in the past, as well. 
I am wondering how you go from requesting shops to getting self-assign status with them. Is it a matter of time?  Is it number of shops completed?  Does it depend no who schedules your area? Any old hands know?
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton