With designer frags, available at $30-40 online (~50% off retail), the risk is acceptable to me.
Edit: As for sample-giving. I won't give my business to a place that refuses samples, at all. If I get samples from a place like Sephora, but buy the product online, I make sure I give some other kind of business to them. In this case, I buy all my skincare products there.
Having said that, if I meet an awesome, generous SA, I'll definitely go out of my way to get "qualifying" products from them!