Animals who in the wild would never meet often do mate in captivity. Many things prevent species from intermixing in the wild - different mating seasons, habitats, active time, anatomics, behavioral etc. In captivity, many of these issues are not present so you will often get unnatural pairing and spawning. Whether you want to do that purposely, is another discussion.
Devious - Most anemone species live ( relative to humans ) long life spans. Granted I haven't done a scientific study but a cursory glance through any reef forum/site - MR, RC, WWM, etc - and you will find plenty of anectodal evidence. Most specimens that make it into your LFS are already in bad shape due to poor shipping/capture/acclimation. Then they are often - if not usually - bought for completely inadequate systems. How many threads have we seen - my anemone got blended in the PH, puked its guts and died, shriveled and died, refuses to eat and died, stung half my corals and died. So even a ' sucess story ' of lets say five years in a hobbysit tank compared to a natural lifespan of 100 years or more for many species, is not really a sucess story. Add that to the fact that a large percentage of people buy ( the wrong ) anemone to host their clowns in the mistaken belief that its needed for the clowns.
Devious - Most anemone species live ( relative to humans ) long life spans. Granted I haven't done a scientific study but a cursory glance through any reef forum/site - MR, RC, WWM, etc - and you will find plenty of anectodal evidence. Most specimens that make it into your LFS are already in bad shape due to poor shipping/capture/acclimation. Then they are often - if not usually - bought for completely inadequate systems. How many threads have we seen - my anemone got blended in the PH, puked its guts and died, shriveled and died, refuses to eat and died, stung half my corals and died. So even a ' sucess story ' of lets say five years in a hobbysit tank compared to a natural lifespan of 100 years or more for many species, is not really a sucess story. Add that to the fact that a large percentage of people buy ( the wrong ) anemone to host their clowns in the mistaken belief that its needed for the clowns.