if it's no longer enjoyable, then I fail to understand those that persist.
As I mentioned before perhaps its because they see it as part of a bigger picture.
Why train to run a marathon ? ...cant be pleasant can it..but people do it ...why ? ...because they want to run a marathon in the end.
Why sit out in the wet and cold day after day by a lake ? ...because you want to catch that one fish.
I dont see a difference. Its about persistence and dedication towards a goal. Some might say a pointless goal but of course thats their perspective.