I think 40% is really the step child of the system, however it still rocks you can find them. I promptly get rid of my 40 for 90% when ever i get a chance to swap pretty much oz for oz or can sell to someone that'll pay high and then hit a shop with low 90 and pick up halves or quarters. I will not get rid of them if i am going to lose silver or have to come out of pocket.
This usually ends up getting me the same toz or if lucky a touch more silver. All with no cash outta pocket besides the initial .50.
Anyone else unload their 40's quickly as well?