Andy Smith writes "One professional photographer in Somerset, UK, thought he was drumming up lots of extra business with a special deal on the Groupon group-buying site. Sadly he has ended up committing himself to nearly a year of unpaid work, plus he has to give out over 3,300 free prints." This analysis seems to be based only on the author's observations (rather than the photographer's experience), but the numbers are interesting. It can't work against everyone, though, or I bet there'd be fewer repeat advertisers on the daily-coupon sites.
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