To be honest, SBD was designed to be at least 1 US $. But only this 1 US$ is guaranteed by the system. If you don't sell SBD when it is at 10$ or 5$ or any other value higher then 1 US $ you are speculating that there are more people that don't understand the basics of SBD system. This is a risk you should be aware. But the more people understand the system and how it is designed the more the rate will always go back to what is guaranteed. Thats only 1$.