Reading from other users, this is probably not a popular opinion. I think people who listed their card to sell have a weird mindset. If you are nickel and dime your consumer, you will not get that consumer back. that's just not good business. Anyone knows that "regular" is often more important to nurture and maintain.
In regard to price spike. My question is, so what? when you listed the price doesn't that means you were willing to let it go at that price when you listed? even if the card became "demanded" and it spike 15-20% ... but your mindset was okay to let it go at that listed price already, where is the lose? If you think the card is undervalue, then increase them above market price, or don't list them at all. it's not that hard to judge cards. Looking at it in another way, let's say if the price tank, are you going to lower the price to match? i know most seller won't. Why does it only work one way? I also feel like these loses from not price correcting on time is not a big deal. How many card do you list of each copy?
how many spike card are there within a day, or even a week? so what are you losing at the most? $10? $20? You do realize that most spiked card eventually come down if you don't sell them off, right? Isn't it better to just get rid of them to have capital? even if it was underprice a little bit?
the only type of card that does not go down, or go down very slowly are Commander cards, and those rarely spike. you can just read the card and hold on to those till it spike. no one is forcing you to list them. List 4 card of each copy maximum, and you will regulate the opportunity cost of spike card and vulture. You do price correction when you have to relist them. it's not that hard.