Thinking about going to the cosmetics counter for a free makeover but not sure how much product to buy (since the sales people are on commission)? I asked a couple women for advice. Bottom-line if you just test a single sample you’re not expected to buy anything, but if they spent a significant amount of time
working on you, it’s good form to buy a product or two—as long as you’re happy with the products they used. (Elsewhere I heard a good rule of thumb is to spent about $1 for every minute they work on you.)

Also, a number of companies require a minimum purchase for a full makeover, so it’s a good idea to ask ahead of time.