Fabio's idea might work, wouldn't mind trying to see. I will just repost my suggestion that i put earlier in the shoutbox (sorry for that).
If collectors become cheaper and lasting less time, then I think players with more points (=premiums) will again buy several collectors and still have an advantage, but players with less points will be able to buy as well. 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...
If collectors become cheaper and lasting less time, then I think players with more points (=premiums) will again buy several collectors and still have an advantage, but players with less points will be able to buy as well. 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...