It's not worth it for now, but what if it happens in the future where bitcoin cant be mined anymore or when the bitcoin block reward is already too small and makes the bitcoin network difficulty becomes so low?
you shouldn't worry too much about what may or may not happen a 140 years from now since that is one and a half generation away from today! not to mention that with the way bitcoin is going, so far despite the huge decrease in the amount of block reward (from 50 down to 6.25) both hashrate and difficulty have grown to ridiculously higher values while miners are making millions of percentages more money compared to when the reward was 50!