as long as i know,
this collection belongs to fotolia,
some of infinite images' quality is very low, so they wouldnt be accepted to many of micro's if a single contributor uploaded,
and this make me feel that,
fotolia try to draw traffic with microstock contributors, and try to get some nice income with these low quality images in the first pages of search results
dont know what will the future brings with this collection, but i hope i am wrong and it will be good for us all