2. It is unclear if the Bitcoin have incentives to continue once all Bitcoins are mined. As for the Gates and Buffets of the world: Aderinokun said some of Bitcoin’s critics may have valid points to debate, around, for example, the environmental impact - but she takes issue with Western elites saying there is no upside, or https://youtu.be/luxkmWYMkXA that it is a ponzi scheme, or that it is just for fun. Since you’re saying your order can execute at the limit price or better, your order will execute against the market price (as it’s lower than your limit price). When you’re placing a market buy order, it will fill at the lowest available ask price. Conversely, when you place a market sell order, it will fill at the highest available bid. The bid-ask spread is the difference between the highest buy order (bid) and the lowest sell order (ask) for a given market.