Garbage. Editors are looking for good material to publish. They're not buying solely from the well-connected, unless by "well-connected" we mean people who have the modicum of sense required to search out and hire competent agents. Publishers are in the business to make money, and if they think a particular writer's product can help them do that, they'll be eager to get that individual under contract.
The whiny writer goes on to say, "I get no feedback from a form letter saying, 'this material isn’t right for us.' Sure, it’s easy to write another book, but will it be better?"
Ah, gee. I really hate to see a fellow writer display ignorance of that magnitude. Snookums, where did you get the idea that it's an editor's job to instruct and encourage writers not already under contract? And as for your ludicrous line about it being "easy" to write another book, I can only suggest that if you honestly believe that, you are almost certainly doing it wrong.
Again, we're offering products for sale. If the "retailers" don't want to buy our stuff, that's their business. They don't owe us any feedback on how we can improve our wares and make them more appealing.
Here's part of Mad Max's reply to our clueless comrade:
If you're not getting published, it sure ain't because you're not part of the "In Crowd." This conspiracy-theory gobblety-gook is a favored excuse for people who haven't got the talent or haven't got the drive, or both. The world is lousy with literary agents; and literary agents only get paid when they make a sale; so they're a competitive and fast-acting group. From my perspective, there are basically two reasons why a writer doesn't have an agent: either the writing's not quite good enough, or the writer hasn't applied himself seriously--doggedly--to finding one.
I don't have an agent because I never went hunting for one. With my first manuscript I targeted a publishing house that was known to look at unagented material. But most writers do need agents, and that Catch-22 everyone talks about--that you can't get published without an agent and you can't get an agent without having first been published--is an absolute myth. No, you're not likely to snag a Big Name agent. But you can get someone capable of sliding a manuscript onto an editor's desk.
And if your work is quality stuff that fits your targeted publisher's market, that's all the "edge" you'll need.