Yes Phil, my suggestion aims to get more people involved. Its the same principle. And, to answer to fiks, premiums still have advantage because they will be able to buy more collectors.
Can't find the discussion thread for collector's problem, so I will post my suggestion here. If collectors become cheaper and lasting less time, then I think players with more points (=premiums) will again buy several collectors, but players with less points will be able to buy. When collectors dissapear, then by killing some more skeletons you will be able to buy again, but you will not have to shoot all the time. People that shoot just to kill, or out of spite, or don't care for challenges, maybe they should reconsider why they are still playing this game...