The thing about selling here on BF is getting enough eyes on your prize. That means that you need to be patient and prepared to relist - maybe 2, 3 or 4 times even. Some of the individual sale threads get bumped off PAGE 1 so fast that your eyes pop out. That speaks to an active exchange. I have relisted knives 3 or 4 times and eventually my offers have sold - sometimes for MORE than my original asking price. It's all about getting the right pair of eyes.
Good photos, accurate descriptions and a fair price are essential. Tell us what you want for $$s up front. Folks sell stuff for NET all the time but I suspect they lose more sales and/or get more aggravation than those who say up front what the total delivered/PP fees costs will be.
Good photos are worth the time. Don't send us to another web site. Learn to post at least a few good images in your post. DON'T do such huge close ups that your 3" knife looks like a 6" knife but DO post detail photos big enough that we can see the details. The more up front info/qualifiers that you provide the easier your sell will go and the greater the satisfaction of all involved. My 2¢ but I've bought and sold quite a bit here on the BF exchange with much better results than on the bay.
You experience may differ but to be fair, it took me at least a dozen sales before I figured out a good system.
And - by the way - the secondary market is fickle at best. If you think that you will get all your money back on every sale - forget about it. Likely you will take at least a 15 to 20% hit - even on LNIB knives after fees and S&H. Just the way it is.
Your milage may vary.
Good luck.
Ray