a) they outline what I'm looking for.
b) it's much easier to select poetry once you get a feel for the poet in general; one poem isn't enough to judge this, unless it is an absolute show stopper.
c) there is only a certain amount of room in this totally self funded project.
d) many magazines have similar guidelines and learning to write a good submission is an important part of getting published.
As always feel free to email (enamel dot editor at gmail dot com) with any questions that you have. I'm looking forward to reading more submissions!