i collect bc i dont use them. or at least just a minimum. i like games where i dont have to but i can do. most of them i spent for alliance or buying items slots. and thats why i want a plain field for everybody.
token system could be: you gain 1 token every 100 days you log on to the system at the moment you can get uniques (dont know if there is a lvl restriction) or your acc lvl has reached a minimum. a token cannot be shared or sold or anything. if you „buy“ a unique you loose a token. the other player (which you do not see) receives gems. uniques you receive are not the same (as lvl could be different) they just drop as usual one level below your acc. and maybe several more things. but start fram a plain field.
edit: and even then it still could be exploited.
edit2: maybe not making the 100-days linear but a function of toke or time. whatever.