D&D 3.5--I want to be your shopkeeper
I guess I havn't done much with Pathfinder, but it seems a lot like D&D so I could adapt, and ask questions I am sure.
As far as the group vs solo, what if we each had our own shops, in different locations, but were friends who adventured together when the time arose? I also pictured being able to freely switch between the two, to hunt for ores or woods, slay the dragon for its hide and so forth.