...
Higher ranks are applying here because the payment in this campaign for Member rank is much higher (even higher than the payment of Sr. Member rank in other campaigns). Calling them alts is not correct.
Anyways I like Yahoo for selecting the rank for which position is opened.
Taking into account today's bitcoin exchange rate in this campaig user with Member rank can earn more than Sr. Member in most other campaigns (without taking into account the extra merit bonus). That's why there are so many candidates for every available spot. But I do also agree that selecting opened rank is fair bahavior (otherway
in this campaign Member rank members wouldn't have any chances for member possition

probably as well as Full Members

).