Red you posted as i was typing but you are making the same piont as me but without all my waffle. so I've added this bit
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I spent a lot of my late 20s to early 30s working in various sales jobs ( I thought sales would lead to riches & happiness

) I sold double glazing, cars, maintenance chemicals, etc etc.
often I was told to trawl through the old files and look for orphan customers ( customers who had been previously sold to by a departed salesmen) to contact.
I was constantly told that its easier to sell to (& keep) an old customer than it is to gain a new one. In double glazing we were told it cost £500 to get a new customer through the door, but getting an existing customer to buy again cost £75. so as you can see it is cheaper to keep old customers than try and get new ones.
in high value sales this is true but we cannot use the same theory with carpet cleaning, if you spend all your marketing money selling to your existing client base you will not get the same response as if you used that money gaining new customers especially when used with marketing you know will work.
I have many times spent over a £100 sending out:
reminder cards,
thank-you letter,
next door letters,
Easter cards,
Xmas cards etc..etc.etc
all to existing customers IT NEVER BRING IN MORE WORK THAN IF I HAD USED THE SAME AMOUNT OF MONEY ON FRESH MARKETING.
carpet cleaners have said to me, " i sent out 200 reminder cards and got loads of work from the them" now this is true but how many of these customers would have contacted him even if they hadn't received a reminder card? I've stopped mailing out all the stuff I used to send out, and I still get old customers ringing me and recommending me to the their family and friend.
We all need to take a logical look at our marketing and put a price on it ( including the amount of time used ) and we need to stop believing everything we read, just because its works for car sales doesn't mean it will work for carpet cleaning.
befere spending hours printing out all them letters and buying all those stamps ASK YOURSELF CAN THIS MONEY BE SPENT MORE EFFECTIVELY.
Mike