Sorry for the necro - I own a full set of unredeemed BitBills - 1, 5, 10, and 20 BTC denominations. You are correct in that they look like a gift card. Here's a searched image for them:
I think most holders of these are in it for the long haul. They preceded Casascius, so most hodlers are very early adopters.
You're welcome to make an offer if interested.