If I buy a knife legally, I can sell it to a willing buyer at an agreed upon price. It's no one else's business.
Yes but it still leaves a bad feeling with those that want to buy the knives because they want them when they see obvious flippers who just clog up the order books with the sole intent of flipping. And when it is instant turn over it is even worse. Paying the ridiculous flipper mark up because you can't get in the initial buy is frustrating.