As I step into the query coliseum again I do so with a heavy appreciation of what agents go through. Impressing an agent is so hard that sometimes we writers forget their job is hard too. Being patient while waiting for someone to judge the culmination of your hard work can be difficult. Agents sometimes receive thousands of query letters a month. If you work a forty hour work week that's 50 queries a day. If that sounds easy don't forget agents also have workshops, conferences, retreats, and book fairs to attend. Not to mention they have other clients who's work they have to sell which means meetings with editors, as well as phone calls and e-mails to those clients and editors.
I actually heard a few complaints from writers who were rejected that the agents responded too fast. If you don’t understand how an agent can decide so quickly then you need to read The First Five Pages by Noah Lukeman. That book explains how an agent can tell so quickly and from such a small sample of writing whether or not you and your novel are for them.
There is something discouraging I've noticed this time around. More and more agents are taking on the policy of only responding if they are interested. Sadly, it's not the agents I'm disappointed in over this. Many of them say this is due to the negative responses they've received from a 'no' answer to a query. Some have been threatened and harassed. Writers this should go without saying, no means no. Threatening and harassing will get you black listed in this industry. Don't do it. When you see an agent with the 'no answer policy unless they're interested' don't get mad. It's our fault. Maybe not you, certainly not me, but there are writers out there who ruined it for us.
Remember patience and respect will keep you in the fight.