There are dozens of articles on the net as to why groupon doesnt work,
The customers are bargain hunters who wont stick...
There is no guarantee where they come from within the area so could only get one per estate or street
All 22 of mine tonight were on one small estate so the cleaner will only move 4 or 5 times...
No guarantees from groupon and they collect the money so you are not in control of finances...
They normally slash prices and then take a cut of that so you could end up working for days for no money and no long term customers...
I could go on....