The reason that accepting compliments with grace endears you to others is partly due to the fact that such graceful acceptance is NOT obligatory - there is no mandate or rule from the site administration on using the THANKS button. The site administration only makes the button available to those who have a genuine desire to appreciate the time, kindness, and effort of others.

Given that Courtney reacted so speedily, I have no doubt that she does have the genuine desire to appreciate other people's time, kindness, and effort.