There is NO MYSTERY at all how SR values the btc. The mystery is how after over 500 threads about btc on SR, an explanation in SR wikki on how it works, countless post explaining btc on SR and yet there are still members that do not understand it. Also realize that if someone has a $ amount in the description of their item it could be outdated and therefore wrong or they did the math wrong and therefore wrong. Either way, the amount the item is listed is the price you can buy it for right now. Also is your account set to US DOLLAR or btc? you should set it so you see everything in dollars...then at check out it will give you the current SR exchange rate and tell you the price you need in btc. And if you ever want to see how much something is...you can just add it to your cart. To do this go to account and then on the right hand side go to Settings. Then on the left hand side click display in dollars. Then click update profile and your done!