The reward given to miners will be divided into two that is, Miners used to get rewarded with 12.5 BTC but this time it will be 6.3 BTC so the benefit is low and can discourage some low-level miners that are just new to the business and can't make enough profit out of it. Because of the electricity consumed and the number of mining hardware in their possession. It is sure to know that the people that have been mining consistently will know how to do their plus and minus. This is the third time miners reward is being divided. So people that know the business will still be available while those who are new may not be familiar and leave. Just know that some miners will drop.