One way Reddit could make money and please users is if they targeted commercial non-advertising use. Many subreddits are either customer support, product PR, or brand management factories even if they don't explicitly state so. Everything from interviews (AMA), sports, entertainment, movies, music and news to porn. A significant portion of active submissions and comments are from employees being paid. Big and small companies are spending money on people who spend time on reddit.

By identifying and charging commercial users it will clean up reddit for the normal user and increase income.