<p>It certainly increases your chances to have more selective colleges on your list. However, it is not always an exact benefit. There are diminishing returns when you have so many apps to do, interviews, and of course, keeping up your senior year grades and activities. Some schools, the LACs in particular, require demonstrated interest. </p>
<p>I know a girl who applied to over 20 colleges. With help from her parents and keeping very organized file, she was able to do a good job. However, I found it a pain in the rear for 10 colleges for my son. All the danged attachments, and the customized apps were time consuming. Not to mention the visits and interviews that were needed for about half of his schools. To have had done 20 gives me the willies.</p>