Shaun, so far our stats show that 95% of groupon customers are "high end" - solicitors, doctors etc (people with money) average age - late 30's-45 with teenagers.
We have found that people are using Groupon to find out what the companies are like as they have been ripped off in the past with poor quality works.
So far we have gained extra work off every groupon customer whether it has been their houses, their relatives or friends and even their place of works.
Seriously, have any of you ever directly marketed 400,000 (Bristol/Bath) people in 5 days with backing from a major worldwide company and if so at what cost ? - It was free.
Its not for everyone - but it is working for us