what moron would pay $49 cash in advance to a stranger for the possible delivery of a store specifc gift card for $50 that might be valid.
You would be surprised at how many people pay full face value for gift cards on eBay.
Be warned that eBay has specific rules for gift card listings - only one gift card auction per 7 days (7 days counted from the END date of your last gift card listing), limit of $500 per card, and only one card may be offered in each listing.
Personally, I think anyone buying a gift card on eBay is a fool. That category is flooded with scammers.