I would imagine that it is more of a question of degree than a yes/no thing. Also, simply purchasing the coins seem to me to say less than actions in a predict

I would imagine that it is more of a question of degree than a yes/no thing. Also, simply purchasing the coins seem to me to say less than actions in a prediction market could. If someone claims to believe that the price will be above a particular quantity at a particular point in time, buying some of the good doesn't really reflect that exact belief, only that they believe that the price will go up on some timescale. A bet that the price will be above a particularly quantity at a particular time more clearly indicates that they believe that it will be above that quantity at that time, I think.