You're lucky to get to see a photo of the knife in the Exchange these days.
Unless it's a "custom," all the info about any commercially made knife is available online and easy enough to look up, which I'm willing to do, but I will NOT ask the seller for any pics. No pics, no interest. At least not from me.
Gotta see a pic of the knife for sale because, while the specs are standard, the condition of the knives are not and no one should have to "ask" for a pic.
More is better but the failure to post at least 1 pic of a knife someone wants to sell here is pure laziness IMO; lack of tech know-how to do so is NOT an excuse. If you can post a listing to sell a knife, you should know how to post a pic too.
And, if you are selling multiple knives, the failure to post individual pics of each knife is likewise laziness IMO. If you want to sell your sh*t, then you should be willing to put in the effort necessary to do so.
The more info available, the more likely it will sell w/o the need for potential buyers to play "20 questions" w/the seller.
These basic sale "tips" should be posted in a "sticky" at the top of each individual sales forum.
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As for the method of payment, I have been sending PPFF and cash equivalent payments for knives being sold by members w/an established sales/purchase record but will not buy from anyone else unless it's a PPGS payment.
Some new members are using their trading history on other sites to establish their credit worthiness but I haven't purchased a knife from anyone like that but if I did, I certainly investigagte their "bona fides" carefully.