Like Lisa said, anemones can be "fragged" much like corals can. Notably, Anthony Calfo (which we've both had the pleasure of watching) will cut apart a Sebae Anemone in front of you at a seminar, plop them in a tank, and an hour later the cuts are aleady healed over. It's very awesome.
I watched him with Fluff in Lancaster at That Fish Place last year do the same thing, with the same results. So yes, anemones can be propogated but it takes a few months to a year to get them to grow to a sellable or tradable size.
There is alot of corals to be saved and money to be made in coral or anemone farming, you just need the money and space to do it in.
Always buy captive bred/aquacultured animals if you can and avoid supporting anybody who sells wild caught specimens.