Do you have a chance to buy this domain? renewal thru Namecheap is $39.88
It theory it sounds like a great name, based on exactly what @lolwarrior said.
I think the value would be in developing and monetizing on a site that delivers a regular rotation of current coupons for each of the established registrars of the world (databased blah blah blah), that could generate a decent revenue. To sell it outright, I'm not sure.
There's a few .coupons domains available, but expensive they're costly to maintain.
DN.coupons $85.80/yr
Cellular.coupons $39.88/yr etc...