Hobby? This is serious fruit business
In all seriousness though, thats true. Also some professional nursery Men and Women get too busy running the farm or business. Last year was a heavy hit for some with the hurricane in Florida, still recovering.
If you get bored with rare fruit , you were just on the bandwagon for some reason anyway.
How many different fruits are there to grow, and cultivars within those species, multiple lifetimes can be spent on all the possibilities.