Strongly support the motion, on sensible grounds.
I only lockered something besides the 4 vicious things, fabulous treasure, trisword and crystal ball after unlocking my SECOND extra slot. This has also reduced my options pool unless I want to scum for items or have them in the backpack, and is probably the main reason why much of the implemented stuff generally gets feedback much later than it gets implemented. And I spend way too much time with the game already - I can beat a vicious dungeon, but I don't want to have to beat it every time with something I know I can beat it with just so I can get an item, because that takes even more time out of my life, and I don't even get extra completion.
It also helps create the elitist mentality because it adds additional psych value to over the top items - nothing can really compete with them for the locker slot, to someone who gets comfortable with them. And it's easier to get comfortable with something you got lockered then anything else, which probably created the original "Dragonshield is mandatory" mentality.
It also part of the reason the learning curve related to gods, degenerate strats and vicious fails to teach it's lessons - the limited locker space really constricts player experimentaton options. If locker slots get filled with stuff that looks mandatory before a player can even be aware of all the options (gods for example), items that enable or help strats which the player wasn't able to be aware of will probably never get lockered, the way it is now. They spend too much time with the game reaching VICIOUS, and it doesn't seem likely that after all that time they really need to go reconsider all they've learned. It's the main ingreedient of the "I have no time for this in my life" reaction, and that reaction is really sensible considering how much time someone has to spend playing a videogame to even reach vicious.
So in short - I like the big pool of items - gold costs to add as perma preps - sometimes post game.
I almost got pwned by Shifty Brickwork!