Clinton
There is a well established retailer near me that offers free underlay, free gripper, free doorbars, free fitting.
Are they free - of course not they are built into the price of the carpet.
Do customers think they are free - of course they do, they are guillable, that is why they continue with this offer.
The same reason Carpet right offer 50% off, followed by a further 33% off - do people really believe that they are giving away all their mark-up - yes they do, thats why they keep going in there.
The buying public love an offer, whether it is genuine or not, it just depends on how it is worded and whether they perceive it to be of value.
Steve