I think the OP is speaking over the overseas visitor airpasses and not the coupons? Please clarify - they are very different products - one is priced in US$ one in INR and targetted towards Indian clientelle.
see link for details
http://www.jetairways.com/EN/MY/Spec...ndiaFares.aspx
It's actually not a bad deal but really depends on how many sectors you plan to fly... depending on that might be either cheaper to buy one fare coupons or sector fares.