Trying to find an agent/publisher

What a catch 22 situation. Writers are suppoed to only approach one agent at a time. At that rate a writer would only be able to send out about three proposals a year. I've sent out lots of enquiry letters. One page long. Some agents have taken six week to send out standard rejection letters. How long s=does it take to read and make a decision on a 1 page letter? So I'm abandoning hope and going the blog route instead. I'll be posting my query letters and short episodes of my novels Vissi d'arte, Eumeralla and The Doll Collection.