I do not think that an accurate count could be made. I just adopted about 1000 profiles that are related to a family member and none of them had any biography or source information in them, they were not placed in the Unsourced category either. I have to say that I will not be adding most of them to that category either because I always try to find a least one source before adding that category label to any profile, but it is going to take quite a bit of time to work with these not to mention others I discover along the way. These profiles were created in 2011 long before the current GEDCOM process was in place and it is not the first that I have found so the number could be quite large for unsourced profiles that are not marked unsourced. All I can say is that the number of unsourced profiles decreases every day due to not only my work but also the work of many others who are trying to fix this problem.