I like the idea. I'd suggest some effort be put into the grammar on the website and blog because small things like that create a negative impression for some people.
Example, from:
Poucher lets you generate discount vouchers, for the restaurant or bar you like. The more Poucher users in a restaurant or bar means more discounts. So pick the nearest venue with highest population and enjoy your live discount.
To:
Poucher lets you create a discount coupon for the restaurant or bar you visit. The more Poucher users in a restaurant or bar, the higher discount you'll receive. Get Poucher now and start enjoying your live discounts! *Disclaimer: Discount coupons are only available for participating venues and valid for the visit - (see our list for participating venues near you.)[link]