Attractive results with the potential to draw attention to your page versus your competitors.
Possible increase in Click-Through Rates and Lower Bounce Back - If the user has more information up front about the page, they are more likely to click on the link and less to bounce back.
Sites using schema markup tend to rank better in the search engine results than companies without markup. It is unclear whether or not the better rankings are due to schema markup there seems to be a correlation. According to a recent study, pages with markup rank an average of four positions higher than those without schema markup.