Hi,
If retailer X offers you 20% discount for anything in store, but you'll need to buy a coupon upfront for no less than $1,000. Would you consider it? This effectively means that you will be buying $1,200 worth of goods for the $1,000 that you paid.
Cheers.
10% is not worth it personally unless it's a seamless instant purchase.
So if I'm buying a fridge for $1,000 and go to corporate rewards program to buy a voucher 10% off to pay for the fridge straight away then sure.
If I have to do a two-step process at separate times then no.