Flipping definition: Buying with the intent of creating an artificial profit margin based on perceived value/scarcity. Different from investing or collecting.
Flipping isn't good for business though. Lets take for example the music industry. I know people who saw bands get just popular enough for local market, get to where they were selling tickets rather than door charge, have those tickets get scalped, but because the scalpers artificially inflated the value, the fans couldn't get in, those who did were not as involved, and the bands were unsuccessful. Even if the tickets paid the venue, if there are no fans to buy merch, the band can't buy food, they can't continue. This is a common speedbump for starting acts.
Take for example what happened to that company that was selling a very generic 3V survival knife. The hype combined with the re-selling put their knife into a price bracket that demands 100% F&F, where the original price had some wiggle room. This combined with the mindset (right or wrong I'm not here to discuss) of the main personalities involved, contributed to sinking them. Its like the young movie star that gets their first big movie then self destructs. If the hype is artificial, its generally bad.
Yes there is something to be said for price following demand, but if I'm selling 100$ knives I'm going to be making 100$ knives. If those knives are effectively on the market for $400 then the customer expectation is going to be for a $400 knife, and the sunk cost fallacy means that they act as though its a $400 knife, even though that was never intended. This can be enough to damage the maker's reputation, keep the product from moving as far as it otherwise could, but because its artificial, the maker cannot rely on the benefits. What happens if the maker decides to bump their price to 200$, so that they can expand production, and the flippers leave? Now they possibly have an over-priced knife, and damage to their brand that might not be manageable.
Day-trading adds unnecessary volatility to the stock market, and thus causes additional difficulties to us all. Its the same scam, just different arena.
How do we fix it? As I said before, I don't know that it is a simple thing, but I do think it has a lot to do with the culture of collectors, and how the community acts around it. I think the social pressure of calling out flippers and making them unwelcome is as good as can be done. Helping people value their knives appropriately, and honestly is another thing. I think price removal on ads just makes it harder for people to make a valuation of the market. Even a few data-points help someone get an idea of where the fair price should be. Yes there will always be investors and people looking to drive profit, but at the moment it seems like all they add is artificial scarcity. If you only love a knife because its rare (not the same as knowing the maker or it being custom) and you have had nothing to do with it being made, there is a term for that.