It also helps with that 'reminiscing factor' in these maps as these are where we the older generation of players learned to farm lockeds. Also it would encourage people to buy 10 luck elixir kits to trade which in turn generates more revenue for sts as people would love to run brackenridge and km3 again but here again the balance between buying and looting would have to be considered assuming that '1 small locked' would be worth 1.5k and a luck elixir 10k. It wouldn't be simple to implement into the game as there are many factors to consider therefore for now it's simply a suggestion.
Btw kiri your english is awesome considering it isn't your first language, well done brother