Coast Wholesale Appliances Ltd

I find that unless you're referred by someone you won't get the service you would expect from the sales. I went to the showroom prior to construction to price out the appliances i'll need. I didn't have referral at that point, so i asked for any sales to help me. The sales expects me to know exactly the brand and model of appliances i was looking for but i told her i need help and guidance in selecting what i want. The reply from the sales lady was that "we sell to builders only, you need to know what you're looking for before coming here". My question is, why are they advertising on radios and magazines if they don't want to deal with walk-in customers?