Is there a central company that sends all college letters?

<p>Lately I've been receiving tons of letters from colleges all over the country. I've noticed however that they all have the same exact format. It will invite you to take an online quiz like "your personality- your major!" and then offer to send you some guide like "secrets of college admissions." While they all have personalized letterheads and envelopes, the content is basically the same. I've noticed that all of the return envelopes are either addressed to Akron, Ohio or Washington, DC. </p>

<p>I wanted to know how this works. Do colleges subscribe to some company that sends all these letters?</p>

<p>If so, why? They're repetitive and probably a waste of money. At this point I usually just throw them out right after opening them as they give me no useful information whatsoever on the college.</p>