Not anymore. Be careful on that other auction of yours, you can't send things through phone numbers I believe. Make sure it complies with Listia rules :)
Everyone is VERY nice here! I've never had a problem with scamming and that kind of stuff. (Some people may not trust you since you're new, get verified, start from small auctions to bigger ones). GIN stands for "Get it Now" and buyers can use this to buy an item immediately for a certain amount of credits. (GIN is normally higher, obviously).
You have to have atleast 5 positive feedbacks as a seller to get your seller wings *I believe. Not sure... After you get your "Seller Wings" you can do things like GINs. Look on Listia's website under badges. It might help. Or FAQ. Sorry, I don't even remember exactly. Just remember though, when you're a seller, using GIN involves small GIN fees. Sometimes you're better off with an auction.