Answer 2: The return on investment (ROI) is not necessarily the same, since the revenues and chances of success are not necessarily linked. The chances of success are based on random factors, such as the amount of blocks mined and the amount of coins in each block. Therefore, even if the chances of success are the same, the amount of coins in each block can vary greatly, resulting in different returns on investment. Additionally, the amount of time it takes to mine a block and the amount of energy it takes to do so can also affect the ROI. Therefore, it is impossible to know for certain if the ROI is the same since the revenues and chances of success are not necessarily linked.
