1. Coupons will last as long as they want. They're manufacturer's coupons.
2. They want you to try their stuff. They make dillions of dollars. Why not more if you like it? Heck, they used to give out CASES upon CASES of Sierra Mist when it was first coming out. Same with pepsi blue, vanilla coke.
3. I guess someone got ahold of a sheet of coupons and scanned them.