Some stores are easier to steal from than others. Airport stores, for example, are very easy to steal from. Superdrug and TK Maxx, on the other hand, are pretty suicidal to shoplift from. In Fenwicks it's relatively easy to take very expensive items without being detected. I have a friend, for example, who stole a Mulberry bag from there because she put it on her shoulder and just walked out the store, ignoring the beep, thereby looking innocent, as the alarms tend to go off sporadically anyway.
So, in other words, I think it depends on the store. Also, for the record, I'm not a shoplifter (I'd never have the balls!) but I have several friends who partake in this sort of activity...