Just a suggestion to group buy sites. Before making deals with vendors, can you please tell them not to treat coupon customers any different to full-paying ones? Better yet, get them to sign an agreement.
Specifically when trying to make bookings, they SHOULD NOT be asking whether or not a coupon is going to be used. If the vendors can't agree to these conditions, don't deal with them! Saves you the pain of having to deal with unhappy customers and weeds out the scammers. You can even declare this on your site and I'm sure more people will be confident to use your services.
What do you think?
I think its good, but i don't think it will happen