Let's get straight to the point.
As an ecommerce store owner or manager, you're very probably aware of the importance of organic search traffic.
Compared to paid ads, it tends to yield a higher conversion rate. Even more important is the fact that you're not 100% reliant on a pay per click strategy.
The ecommerce businesses I work with tend to highly appreciate how traffic comes in day in and day out, thanks to SEO.
Regardless of whether their marketing strategy focuses on other traffic channels, they know they'll be getting traffic and customers daily from the search engines.