For the shotguns Matt said that they take full responsibility for the buff and thst they will fix that ASAP, as for the marketplace goes its to prevent people putting items that nobody will buy and the stop playing the game, i would rather put items every 24h then to have to search through pages of useless stuff to find something i need, and as the mods go i would suggest you if you already have that many mods, why don't you put them on your weapons and store them there, that way you wouldn't need to search for certain mod and you won't have to waste time searching.