Let your history develop past yesterday. Post in a few treads, read the rules and get a feel for the place and the exchange and you will have far less problems. This forum is open to the internet, so theoretically someone can see a knife for sale, join, rip the seller off and be gone the next day. Likely this is not you, but there is no way to be sure and few can afford to be wrong. To be fair there are old member rip offs also, but not many. Even if not a rip off dealing with new members can be more difficult. They may not know the rules or the etiquette of transacting deals properly and create transaction problems. I have no problem with dealing with new members, but a day or 2 is just too new. I would still deal with you being that new a member, but you would have to pay by USPS money order, which is probably not going to be to your liking-so it is easier if I just don't deal with you at this point-sorry, but sometimes experience says caution is only reasonable.
On the reverse side the more you know about the sellers the safer the transaction will be for you