Which one you choose do SEO or Sell your stuff here

I wrote a post about seo career at imfreakz few days ago, but after i have blog here i just thingking.. hey i have new way to promote my product instead i do SEO my site and waiting for few month to see the result.. if i compared between promote my product here and i have my own website and do my SEO own self, have a diferent.. first if i promote my product here.. iam sure it will not stay for the long time because many people make a new post here and my post will replace by other people.. but if iam use SEO, i have a chance to pretend my position there...

Any comment ?