It's not JUST pictures, but real closeups. Show me closeups of the lockup, the centering, both sides of the blade, each side of the scales. TELL me if the lockup is solid or if there is blade wiggle or lock-rock when you try to "gently" move the blade tip left and right, up and down. I want to know all about scratches, bumps, mars, and anything that keeps this knife from being as brand new.
Pictures are NOT so very important if the seller advertises the knife as "NEW IN BOX" or "AS NEW IN BOX." Either it is, or it isn't. In the event that a knife has been used, then the pictures become much more important. For knives which are described "as new in box," more simplistic photos are fine, as most of us can use Google to find out more specifics of a particular model.
I want to know whether the blade edge is "factory" or has been sharpened at some point after the sale. It makes a LARGE difference to me. I try to purchase only factory edges. That is just my personal opinion, as most knives that I purchase are as new or NIB.
For payment, many of us like PayPal (PP), and sellers expect immediate payment using PayPal. You(as seller) can use "standard" PP and add about 3.5% to pay your seller's fees, or just ask for PP Gift. Be careful, however, as using the "Gift" option is something that PP rules disagree with. Also, if there is a problem with receiving your money or a knife, the fact that PP Gift option was used might well keep you from a good resolution with PayPal. As I understand it, PayPal will "support" you when the standard payment option is used.
Feedback is important. Positive feedback is really important, in my book. If a guy pays right away, give the buyer positive feedback. If you receive a knife in the mail, as it was advertised, leave the seller positive feedback.
IF a seller tries to scam you with a knife that is worse than advertised, let him know you will return it. Negative feedback can help (REALLY) to keep out some of the repeat scammers.
I recommend mailing a knife using USPS Priority flat rate boxes, and they come in a lot of different sizes. The cheapest (smallest) one is good for almost every folder ever made, and costs only about $5.40 to mail it. I don't bother with insurance, buying or selling, unless the knife costs more than $200. USPS automatically gives you a tracking number when you mail the box, and I've never "lost" a knife in the mail, with or without insurance, in the last year and sixty or more transactions.
Usually common sense and common courtesy will result in a good transaction. It is rare that it doesn't. Most folks are honest, and a honest description and pictures of a knife will go a long ways to ensure a mutually satisfactory transaction. If information is left out of the description in the thread, then PM or email the fellow and ask about it.
You can let a seller or trader know, reasonably, that mutual satisfaction is expected or the trade or sale will be reversed, with both parties responsible for mailing it back again.
This is a fun hobby, and strict honesty and full disclosure in our dealing helps to keep it that way.
Sonnydaze