Shaun, I keep meaning to post a topic about what i believe is a myth, that it costs 7 times more to find a new customer than keep an existing one.
Woodman, My opinion of BOGOF is tainted by seeing it all the time in bars around town, (buy one Redbull get another one free). the most important point with any special offer is,
it has to be believeable if the customer thinks they are being mislead they will not go for it.
your past customers know your prices, if they see you offering a free bedroom clean but notice your other price has been increased by the same amount they will think you're ripping them off.
i like to offer free stain protector but i always qualify the special offer by explaining that
"we've just bulk purchace 50gl of our advanced stain gaurd solution at a very reduced price, so we are able to pass our saving onto you" Put like this the customer will believe that they are getting the stain protector for free because i've told them why I can give it for free ( we've bulk purchaced it)
There endeth todays marketing lesson
Mike