If there is no cost to give it a try then you could promote one offs and bigger jobs and then inflate your prices to bring it into line once the discounts and groupon fees have been taken out. Not sure how much take up you would get but if you could do it that way then it could work.... Gets your name out into a huge marketplace I suppose....
see,your thinking in a more educated way!(not like the others by the way i am whispering so no one can hear me

)
(back to normal voice)
its more for one off's that i am after,ie gutter cleans,etc not the windows
so i just wanted to speak to someone who may have been involved with groupon and to get a understanding about the pros and cons and what may be the best way of going about it
but all comments most welcome