I have two bubbletips, a long tentacled and a whole lot of rock anemones...they're thriving...it's fine for you to not keep them, and I would really prefer it if LFS's would not sell them as they do beings that 95% of the anemones that come through them die because they sold one to some guy who thought that he could use table salt and a flashlight to set up his aquarium.
But, I also feel this way about most butterfly fish and a lot of angels...they're better left on the reef because their survival rate is so low. But, just as the government doesn't force soon to be parents to show their credentials whenever they're plotting having a baby, a pet store will not ask if you know what you're doing...until someone comes back with a dead anemone demanding that they want their money back. Then they ask all kinds of questions.
Technically, we should leave everything we've got in our tanks back on the reef...but we're human...and we love to collect things. For a while I had a problem with this...but now I'm to the point where I want to buy out my LFS just because I know that I can almost always make the stuff live. I know what I'm doing, unlike thousands of salt water hobbyists. *shrugs* I know the theory about "If you stop buying it, they'll stop harvesting it." but I also know that it really doesn't work...you have to get everyone to stop buying them...and that isn't going to happen...so I figure if I buy it, I know at least it has a very good chance of living.