Just speaking for myself, having mutual respect is key. Of course if I seek your help and the MA spends time with me picking out an e/s, lipstick, whatever, I'm very likely to buy something, because I wouldn't waste their time asking for help if I didn't intend to buy on that visit. Sometimes, though, I go to the mall with friends, and I just feel the need to poke around for a couple minutes, and not buy anything, just look, maybe test a couple colors I read about on here. In those cases, I will just politely tell the MA that I'm just poking around and I don't need any help at the moment.