Maxus wrote:
You will never know for sure if your attempts to make a good SEO will bring you top positions in SE. … You’ll never know for sure if your efforts will bring some fruits or you lose – it’s gambling.
I have to disagree with this. I would never rely on gambling to support me or my family. If you know what you are doing then you DO know if your efforts will improve your business. Careful planning and testing and learning from your mistakes will help. If your just throwing your money and time out there crossing your fingers and hoping for a good ROI then your destined to fail.