just got off a long convo with groupon, they're now cold calling companies i can't imagine why. they said they'd like to go with put a deal like £29 for 2 hours cleaning, of which groupon keep half, so that's less then £7.50 per hour! he said he expected that we'd keep 80% of the customers though this of course means groupon will be losing 80% of their customers, can't see them allowing that. you're essentially paying to 1) clean someone's dirt, and 2) make groupon a big company.
only one good point he made was that as the customer pays for the deal straight away but often waits a few months until they use the voucher that you'll have had 2/3 pay cheques since then so more likely to not mind another £30 increase for the hallway for instance, however what i can see happening is customers saving it for when the carpets are dirty or important occasions like xmas so you'll be stuck paying to clean carpets in the busiest period