I just love any pcb populated with components, there is no help. I dont know if there is all be usefull, but I collect em all... In some point, realize that, if I cant find fast some components what I need, it is no efficient to store pcb in this way. Whatching others who desoldering few usefull components, and all other throw away, is no sense to me, because, many time I found that just specific components I need and will be happy when I have it. I try to desolder almost all common component and place it in small bins, but too many components do mess and bin not practical anymore, and many time...