Those who opt to pay someone for that strategy are those who want to earn profits fast. Because they thought, the strategy will also work on their end. However, it doesn't work all the time as each project is different from one another. You need to have a good grasp to understand what's happening with the coin. So you won't be executing your trade blindly.
Better to work out yourself than to try to make profit fast and especially by buying strats from other people.. It usually doesn't end well..