I just bought a coin from a guy on VCoins, who DID toss in something extra--along with a very nice coin, he included a BRIGHT PINK AND LAVENDER pen and keychain flashlight with his business name and contact info.
I love the coin, and he was very prompt shipping it, so I'll do business with him again if another coin turns up, and I'll definitely be checking out his website.
However, the SWAG didn't have its intended effect. First, these gifts are not as practical as they might be coming from a different sort of business. I'm unlikely to go around with a brightly colored pen and keychain labeled with a name that clearly has to do with coins, given I'm not planning to talk to strangers about having a collection! And second, am I the only one who wondered if he sends blue and green pens to male buyers? I personally found some humor in it (Wonder what he does if his customer's name is Erin), but I know some women who'd get their feminist hackles up.
I'll give him this--it was memorable, but perhaps not in the way he hoped for.
Probably NOT what your attempted customer was hoping for! LOL.