short and sweet. but needs development no free lunch.
make a site about 6 seo tricks or tools and put them on a site.
then flippa it.
maybe developed it would bring $300-900 because seo is hot and its short.
Unless the number 6 has a particular meaning within the SEO community I don't see any value in this domain on the reseller market. It is short but not obvious hot SEO domain. To get value the domain would require traffic and revenue.